Alrite Matt, na im not in Cardiff mate, im down in Pembrokeshire. Theres only one real reptile shop in the town, but it doesn't do anything like paints. I did try homebase and Wickes, couldn't see any non-toxic stuff though. Mite try B&Q though. I'll have to take a trip to Carmarthen for that tho (30 miles)! Have you made your own backgrounds before? If you did, where did you get your paints from?
Cheers
Guy