some dealer warranty's arent worth the paper they are printed on,
plus you can buy warranty.
my advice is buy a car for around 3/4k that way the car as lost most of its value and sell it after a year maybe loss £500 then buy another for 3 /4k,
buy it for the right price and you will loss nothing.
Trust me you will get sick of paying for it when the buzz wheres off and its lost 1.5k as soon as you drive it home then another 1k 6 months later,
or there the other option buy a banger with loads of tax test for £500 use it till it stops or the t and t runs out

if it breaks down
get the aa to take it to a scrapyard "say you work there"

get £150 back , buy another