Thinking laterally .........If i had £20k i'd buy 2 cars - one shopping trolly and one fun thing.
How often will uncle ron want to have max fun AND need 4 seats in the same journey? Might be totatlly wrong but IMHO the two car approach would suit most people better than the one "compromise" car. This especially works if he good with a spanner.
So now that the practicality is out of the way i'd say;
- Elise
- Caterham
- Cerbie
- Tamora
EDIT : Just reread the post and it's clear i'm an idiot.

I'd still say buy a trevor though. Tamoras are silly silly silly cheap at the moment
Focus ST estate, i3s and more pushbikes than strictly necessary.
....did i ever tell you about the Evora and VX220 i used to own?