Typical STW responses – no answer to your questions, just a bunch of reasons why you asked the wrong question. I presume @BillMC is driving a Toyota iQ, because everyone buys a car based only on reliability index and no other reasons, whether practical or emotional. 🙄
FWIW I’m with Motoreasy for warranty on a 6 year old BMW estate. Not great, probably not the worst. They have two levels of cover – servicing at a BMW dealer, or servicing at independents (cheaper).
As an aside and as an American I’ve never understood the UK fixation on “full main deal service history”, but knowing I’ll want to eventually sell the car I bucked up the extra fee on the warranty for BMW servicing.