BYD Sealion 7 UK Buyer's Guide 2026: Specs, Real-World Range, Reliability and Honest Verdict

The Sealion 7 is made by BYD (比亚迪 / Build Your Dreams), a Shenzhen- and Hong Kong-listed conglomerate founded in 1994 as a battery maker. BYD launched its automotive division in 2003 and by 2025 had become the world's largest manufacturer of new-energy vehicles. The company sits in the Fortune Global 500 and has no material survival risk for UK buyers. The UK dealer network expanded rapidly — from 52 franchised sites in December 2024 to 125 by December 2025, a 140 per cent increase in twelve months, across 38 retail partners.

Three trims as of July 2026. All use BYD's Blade Battery (lithium iron phosphate, cell-to-body integration) and carry 11 kW three-phase AC charging as standard. The Comfort RWD at £47,025 sits below the £50,000 Expensive Car Supplement threshold, saving buyers roughly £2,200 over five years compared with the Design AWD. All trims offer strong standard equipment including V2L, heat pump, and rotating touchscreen.

WLTP figures are optimistic for motorway use. Plan on 74–83% of the WLTP figure at motorway speeds — normal for a car this size and weight. At below 10% state-of-charge, the Comfort RWD's 0–62 mph time stretches from 6.7 seconds to 11.5 seconds — a much greater degradation than is typical for EVs. DC charging performance is below rated peaks in real-world testing.

5-star Euro NCAP rating with strong child occupant protection. One important caveat: at below 10% state-of-charge, the Comfort RWD's 0–62 mph time stretches from 6.7 seconds to 11.5 seconds — a much greater degradation than is typical for EVs.

BYD's warranty is approximately 50% more battery mileage than the UK industry standard. Company car tax is competitive at 4% BiK. However, Chinese owner data identifies rear-tyre abnormal wear as the most frequent mechanical complaint — budget for replacement at 15,000–20,000 miles rather than the usual 25,000–30,000 mile interval.

All UK Sealion 7s carry solid conventional equipment: 15.6-inch rotating touchscreen, wireless Apple CarPlay and Android Auto, OTA updates, and 12-speaker Dynaudio audio. ADAS in UK-market cars is DiPilot 10 — adaptive cruise, lane-centring, AEB, 360° cameras. What UK cars do NOT get is the Chinese 智驾版's NVIDIA Orin-X, LiDAR, and DiPilot 300 Navigate-on-Autopilot system.

Chinese 车质网 complaint rate is 865.5 per 10,000 vehicles. The top issue is rear tyre abnormal inner-edge wear — the most frequent mechanical complaint. Other issues include steering wheel leather peeling, infotainment signal failures, and range reduction in cold weather. BYD ranked 30th out of 31 brands in What Car? Driver Power 2025 — a brand-wide metric, not Sealion 7-specific.

The UK price premium (~2.25×) reflects import tariffs, RHD engineering, NCAP crash-structure changes, the larger battery specification, and dealer network costs. Chinese cars are rated on CLTC — the base Chinese trim is rated 550 km CLTC. Do not compare this directly to the UK Comfort's 300 miles WLTP — CLTC figures are typically 15–25% higher than WLTP equivalents.

The Comfort RWD is the most sensible proposition: strong standard kit, class-leading warranty, V2L, 11 kW AC charging, and a competitive entry point at £47,025 — which, importantly, sits below the £50,000 ECS threshold. Where it genuinely struggles: real-world motorway range is 223–249 miles rather than 300 miles; ride becomes unsettled on imperfect British roads; boot at 520 litres is noticeably smaller than the Tesla Model Y (854 litres). Tyre wear is real — budget for rear replacement at 15,000–20,000 miles.