You will need luck and a good deal of browsing eBay, gumtree, local ads and the like. Maybe ask friends/family if they've got anything they want rid of.
A mate of mine picked up a really tidy V-reg Alfa 156 2.5 V6 for £280 last night. I was gobsmacked. It runs beautifully, so there ARE some great cars out there for peanuts.
I have a 1995 cavalier 1.8 for sale at the moment that would easily get to Italy and back. It finishes on eBay on Sunday and I think it will be around £200. PM me if you want details. I live in Huntingdon, Cambridgeshire.