Toyota vs BYD: What Matters After 100,000 Miles?

Toyota has decades of proven ownership history in Britain. BYD has modern electric-car engineering and an ambitious battery warranty. But when a car approaches 100,000 miles, which matters more: the badge, the warranty, or the cost of keeping it on the road? In this investigation, The Bonnet Files examines Toyota hybrid reliability, BYD Blade Battery durability, UK warranty limits, battery state of health, repairability, servicing, insurance and depreciation. We explain what the evidence can tell us and what it cannot yet prove about long-term BYD ownership in Britain. Thinking about buying a high-mileage Toyota or a used BYD? Tell us the model, mileage and ownership experience in the comments. Before you pay for the badge, open the file. SOURCES AND RESEARCH • Toyota UK — Toyota Warranty: Service Activated Warranty; Hybrid Battery Warranty; Battery Care Warranty (accessed October 2026). • BYD UK Media — “BYD extends warranty of Blade Battery to eight years or 250,000km” (15 January 2026). • BYD UK — “Warranty Policy & Maintenance” (accessed October 2026; older battery-mileage wording remains on parts of the site). • BYD UK Media — “0 to 100,000 in only three years as BYD continues to accelerate in the UK” (29 July 2026). • Geotab — “Updated analysis finds average battery degradation of 2.3% per year” (13 January 2026). • Thatcham Research — “Thatcham Research and BYD join forces to make EV ownership more sustainable” (10 December 2025). • What Car? — Toyota Corolla (2019–present) used-car reliability review (accessed October 2026). • Driver and Vehicle Standards Agency (DVSA) — MOT testing guidance and MOT history records. Warranty terms vary by model, registration, usage and vehicle history. Confirm current conditions directly with the manufacturer before purchasing. This video provides general information, not an inspection or a guarantee of future reliability.