I’m not in the market for one, buy for someone who changes their car regularly, the warranty should cover many eventualities on the BYD, basic 6 years, drive unit 8 years & battery 8 years.
https://www.byd.com/uk/service-maintenance/warranty-policy
My concerns would be depreciation, or if the company pulls out of the UK.
On the other hand, many people lease their vehicles these days.
Bill