Why is everyone so on their high horse about part worns, this is a car that'll be turning up at breakers yards by the dozens, they'll only keep the decent ones or sets, it's not like he's after 22 50 18s that mysteriously end up on a part worn tyre place is it?
OP find a breakers yard that do part worns and see if they have a set of four or at least 2 pairs, they may even have a set of steels with tyres on at least you can see the state of the wheels as well.
Bridges on the A/M23 near Gatwick do part worns and they have a good selection of decent tyres and wheels and tyres.