To a cyclist (ie no knowledge of cars) that seems like wise words.
15K in Premium Bonds & 5K on a plenty good enough car, you'll be in exactly the same position but also making money.
I was going to say 'just buy a Honda and be done with it'.
But I've done even more work for you by googling 'near new Honda's', throwing this up:-
http://usedcars.honda.co.uk/en/used-cars/approved-cars/honda/cr-v-16-i-dtec-se-5-door/details-hka9csr