wot alloys go straight onto a 91-95 civic?
 

17's will go straight on, but what width can the tyres be up to, and also, wot offset? (et..?)

i think you can go up to 215mm wide but you might get some rubbing. go with a 205mm width. i'm not to familiar with the eu civics but here they should have a 38-40 offset

205 is the way to go 215 is a little wide and you'd have to roll your fenders if you plan to drop your ride. I've got 205/40r17's and 215/35r18's on my 95 civic with suspension technique springs and I only rub on the 18's in tight fast corners or hilly turns. +40mm and/or +42mm offset on the wheels.