I think I've finally found a reliable source for heavy grey cardstock. Someone on one of the forums suggested trying picture framers. This morning, looking for such in the Yellow Pages I found a wholesaler of picture framing supplies and a quick phone-call ascertained he was able to sell varying grades of board by the sheet. A quick visit found me walking away with 3 sheets of A0 size board in 1, 1.5 and 2mm thicknesses for a total cost of £6.71 including VAT. I also got his catalogue which includes a huge range of boards, adhesives and tapes which I will experiment with in the future. Unfortunately, they are not on line but the address is:- Hinton Wholesale Supplies, 68 Church End, Cherry Hinton, Cambridge CB1 3LB U. K. or e-mail:- firstname.lastname@example.org They have a van delivery service at £5 or free on orders over £50 or can deliver nationally at £10 or free on orders over£125. However look in you own yellow pages for similar firms as he can't be the only one in the UK and there must be others in the rest of the world! I just realised I forgot to give their telephone number. It is:- 01223 411715 Sorry 'bout that.