Observed adverts, not confirmed stock. Compare like-for-like engines and generations; confirm the vehicle, location, condition and all-in price directly with the seller.
01 · The quick answer
The X4 suits a buyer who wants a raised driving position and coupé styling, and is comfortable checking rear headroom, visibility and parking space before purchase. Start with the engine and generation that fit your journeys, then compare condition and history within that group.
Lower purchase budget: the two 2017 F26 20d adverts below are the oldest cars here. Allow an inspection and repair reserve; their prices do not establish the value of a newer G02.
Regular longer journeys: shortlist G02 20d or 30d diesels and inspect emissions-system history. A mild hybrid still uses diesel and cannot be plugged in.
Performance buyer: cost the M40i and full X4 M Competition separately, including insurance, tyres, brakes and fuel.
Advert check: 30 October 2026. Ten distinct sellers with Greater London branch/contact addresses: nine primary dealer adverts and one secondary AskCar observation. Prices and mileage are snapshots from those pages, not dealer-confirmed stock or binding quotes.
Every card includes its source, car photograph, address, telephone and known fee conditions. Confirm the actual viewing site before travelling, especially where a dealer uses several locations. Blackstone’s contact/location discrepancy is flagged on its card.
No dealership has been contacted by LAI for this update. Availability, accident history, finance status, VIN, ULEZ compliance and warranty eligibility have not been independently certified. The order is editorial and does not rank dealer quality.
03 · Choose for your London routine
Your routine
Starting point
Decision before purchase
Mostly short urban trips
Compare petrol alternatives and an electric option alongside X4 diesels.
Explain your typical trip length to an independent specialist; inspect diesel emissions-system condition and service history.
Frequent motorway journeys
G02 20d versus 30d.
Compare insurance, real fuel use, history and total purchase price at similar age/mileage.
Family with child seats
Test the exact X4 and an X3.
Bring child seats, buggy and usual rear passengers; check roofline, door access and loading opening.
Narrow driveway or shared parking
Measure the exact car and your entrance.
Allow mirror width, door opening room, rear visibility and turning space; verify cameras/sensors actually work.
Enthusiast ownership
M40i or full X4 M Competition.
Obtain specialist inspection, insurance and consumables quotes before paying a deposit.
04 · Generations, engines and useful dimensions
The earlier F26 and later G02 are different vehicles. Registration year alone can be ambiguous around a changeover; verify the VIN/build generation. The 2017 cars in this set are earlier-generation examples; the 2019-onward set is the later generation.
Badge
What it means here
Comparison rule
20d / 30d
Diesel engine families; some later adverts specify MHT mild-hybrid assistance.
Do not assume every 30d has the same output or emissions equipment.
M Sport
Trim designation.
Check fitted options; the badge alone does not prove a camera, adaptive cruise or premium audio.
M40i
Petrol M Performance derivative.
Keep separate from the diesel price comparison and from full X4 M.
X4 M Competition
Full high-performance M model.
Use derivative-specific inspection and running-cost quotes.
BMW’s 2018 launch specification for the second-generation X4 gives 4,752 mm length, 1,918 mm body width and 1,621 mm height; its UK launch information gives a 525-litre boot, expanding to 1,430 litres. These are launch references, not a promise that every later derivative has identical measurements. Body width excludes the extra space needed for mirrors.
Manufacturer references checked 30 October 2026. Obtain the build-specific brochure and measure mirror clearance, load opening and parking space for the car you intend to buy.
05 · Fuel economy and longer journeys
No measured consumption test was conducted for these ten cars. Brochure economy from different years and test cycles is not a fair ownership-cost comparison. Use your own expected UK mpg in the calculator and stress-test it for winter, traffic and short journeys.
For any diesel, ask about DPF, EGR and AdBlue/SCR faults or repairs where fitted, interrupted regeneration symptoms, warning lights and diagnostic reports. Repeated short runs warrant a conversation with a specialist about suitability. A long test drive is useful evidence but does not replace an inspection.
For an M40i or X4 M, use a realistic petrol assumption and request an insurance quote against the registration. Confirm whether the engine, exhaust or software has been modified, and disclose relevant modifications to your insurer.
06 · Considering an electric iX4 instead?
BMW has a separate official UK iX4 page. Treat that as a different purchasing route. None of the ten adverts below is an electric iX4, and no iX4 dealer availability or delivery date is verified in this guide.
The X4 mild hybrids listed here do not accept charging cables. If an EV is your preferred route, first price home or reliable local charging, ask for the exact battery/charging specification, and check the warranty and delivery terms for the proposed vehicle. Do not transfer X4 diesel figures, photos or stock status to iX4.
07 · London checks before viewing
ULEZ: enter the exact registration in TfL’s vehicle checker. A dealer’s “ULEZ” claim is not an independent check, and compliance does not remove other road charges.
Congestion Charge: check TfL’s current charging rules for your actual journey, times and payment arrangements. Do not treat mild-hybrid branding as an exemption.
Vehicle tax: check the registration and first-registration details through GOV.UK vehicle tax guidance; the original list price, age and applicable supplement can matter.
Parking: check resident-permit costs with your borough, driveway access and any height restrictions on your usual route.
Appointment: obtain a written confirmation with the car’s registration and its physical location. A London search result is not proof of a London viewing site.
08 · Annual fuel calculator and ownership budget
Compare two fuel assumptions for the same mileage. Defaults are editable planning examples, not measured X4 results, current forecourt quotes or a prediction for a specific derivative.
Enable JavaScript to calculate: annual miles ÷ UK mpg × 4.54609 × fuel price per litre.
Fuel is only one line of the budget. Add depreciation, applicable tax, insurance, servicing, finance interest, tyres, brakes, road charges and a repair reserve. Compare finance using total amount payable and the same deposit/term/mileage, not just the monthly payment.
09 · Condition, history and warranty
Match registration and VIN across the car, V5C, service records and invoice. Inspect official MOT history and investigate recurring advisories and mileage gaps.
Obtain an independent provenance/finance check; ask for written disclosure of accident damage, insurance categories, imports, modifications and previous use.
Request a cold start and specialist diagnostic scan. Check leaks, cooling, suspension noises, gearbox behaviour and xDrive operation under appropriate conditions.
Inspect all tyres for size, wear, age and suitable matching; ask a BMW specialist about the fitted set and drivetrain implications. Price brakes and any wheel damage.
Warranty branding is not the contract. Read term, mileage limits, exclusions, claim caps, labour-rate limits and inspection requirements. Ask who pays diagnostic costs.
For mild hybrids, ask about relevant electrical-system faults and the applicable component cover; do not assume an electric-car battery warranty applies.
10 · Alternatives worth testing
Alternative
Reason to compare
What to check
BMW X3
A more upright body may suit rear passengers or bulky luggage.
Exact generation and engine; load your own equipment.
BMW X2 / iX2
A smaller-car route with petrol and electric options.
Passenger space, charging access and the full ownership budget.
Mercedes-Benz GLC Coupé
Another coupé SUV option.
Same-age derivative, service history and insurance.
Audi Q5 Sportback
An alternative body style and cabin layout.
Fitted equipment, parking visibility and realistic costs.
11 · 10 London dealerships: exact observed X4 adverts
Snapshot: 30 October 2026. Compare within the generation/engine groups. Asking prices span different ages, mileages and performance levels; this set is not a market valuation or a claim that all ten cars are still unsold.
Known fees are explained in full on the cards. An unlisted fee is not assumed to be zero. Prestige’s total uses its ordinary £249 retail fee; other customer categories differ. Automatic Motors’ total includes its stated £199 fee.
Secondary advert + official branch contact · observed 30 October 2026
Car Planet Barnet
X4 20d M Sport xDrive automatic
G02 · 20d diesel
Car-specific photograph from the linked secondary advert. Image credit: seller/listing image provider. A photograph is not proof of present condition.
£20,950
Advertised price; confirm all compulsory fees.
Advert detail
Observed value
Year / mileage
2019 / 49,752 miles
Fuel / transmission
Diesel / automatic
Registration
Not captured; request from dealer
Branch/contact address
Building 4, North London Business Park, Oakleigh Road South, N11 1GN
AskCar observation, not independently confirmed dealer stock. Car Planet states a conditional £399 fee where an outside finance broker pays directly; request your applicable all-in quote.
Ask for current availability, VIN, actual viewing address, current mileage, service evidence, condition report and a written all-in quote before travelling.
Seller advertises BMW Approved Used, panoramic roof and camera. Confirm first registration, VIN, remaining cover and exact equipment in writing.
Ask for current availability, VIN, actual viewing address, current mileage, service evidence, condition report and a written all-in quote before travelling.
£199 advertised admin fee makes the displayed cash total £13,489. The group also lists another site: confirm this car is at West Drayton before travelling. Two keys and service claims need documentary checks.
Ask for current availability, VIN, actual viewing address, current mileage, service evidence, condition report and a written all-in quote before travelling.
A £699 charge is stated for third-party finance applications, exports and trade sales; it is not presented as a universal cash fee. Confirm the showroom appointment and applicable total.
Ask for current availability, VIN, actual viewing address, current mileage, service evidence, condition report and a written all-in quote before travelling.
Official advert contact shows Scrubs Lane, while marketplace descriptions mention West Drayton. Confirm where the car is physically held. M40i is an M Performance model; obtain insurance and brake/tyre quotes for this exact car.
Ask for current availability, VIN, actual viewing address, current mileage, service evidence, condition report and a written all-in quote before travelling.
Full X4 M Competition. Commission a specialist inspection, check running-in/service records where applicable and investigate tuning, accident repairs, tyre matching and brake condition.
Ask for current availability, VIN, actual viewing address, current mileage, service evidence, condition report and a written all-in quote before travelling.
Ordinary retail admin fee £249 gives £28,349. Dealer lists £99 for qualifying returning customers, £499 with outside finance, and £599 for trade/export. Viewing is by appointment; confirm car is prepared and present.
Ask for current availability, VIN, actual viewing address, current mileage, service evidence, condition report and a written all-in quote before travelling.
Appointment only. Seller lists head-up display, Harman Kardon audio and 21-inch wheels: verify these against VIN/build information and price replacement tyres before committing.
Ask for current availability, VIN, actual viewing address, current mileage, service evidence, condition report and a written all-in quote before travelling.
Seller lists CarPlay, LED lights and heated seats. Confirm fitted options, service invoices, preparation and any compulsory charges; automated specification data is not VIN proof.
Ask for current availability, VIN, actual viewing address, current mileage, service evidence, condition report and a written all-in quote before travelling.
Seller describes six services, a new service and two keys. Ask for dated invoices, current mileage, MOT advisories and independent condition checks.
Ask for current availability, VIN, actual viewing address, current mileage, service evidence, condition report and a written all-in quote before travelling.
Manual notes only; this does not change LAI’s advert observation.
12 · Prepare a dealer-specific enquiry
Select “Prepare enquiry” on a car above. Review and copy the text into your chosen contact channel. Nothing is sent automatically.
13 · Viewing and test-drive checklist
Personal checklist saved on this browser where storage is available.
14 · Before paying a deposit
Save a copy of the advert and written promises. Do not treat this guide, a dealer badge or a “reserved” button as confirmation of condition or availability.
15 · Common X4 questions
Is M Sport the same as X4 M?
No. M Sport is a trim designation. M40i is an M Performance derivative; X4 M Competition is a separate high-performance M model. Budget and inspect accordingly.
Can I plug in a diesel mild-hybrid X4?
No. The MHT cars listed here use diesel with mild-hybrid assistance and have no plug-in charging route.
Which of these is the best buy?
There is no defensible winner without current condition, history, insurance and all-in quotes. Shortlist comparable cars first; an attractive price does not establish low ownership cost.
Are all ten available now?
Availability is not dealer-confirmed. These are dated advert observations, including one secondary listing. Call before travelling and record the response.
Does a Kent postal address exclude a London dealer?
The relevant test here is the physical Greater London branch. Ruxley and the listed Orpington site are in the London Borough of Bromley; confirm the actual vehicle location for your appointment.
16 · Sources, method and related guides
LAI reviewed the ten car-specific source pages and relevant dealer contact details on 30 October 2026. Vehicle photos are linked from their observed listing image providers. Seller claims are attributed, not independently endorsed. Prices may change, adverts may expire and image hosts may stop serving files.
Nine observations use primary dealer adverts; Car Planet Barnet uses an AskCar advert with the official Barnet contact page. Dealer names are distinct sellers/branches in this ten-card set. No contact, mystery shopping, live feed, paid placement or mechanical inspection is claimed by this update.
Manufacturer references, official London driving links and government checks are linked in the relevant sections. This is buying guidance; verify the exact car and written contract before purchase.
LONDON AUTO INDEX
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Ask London before you buy.
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