Oh sorry people, bad description by me, I wasnt having probles finding acrylic/perspex, I was having trouble finding the dual colour stuff that engravers use to make door signs and stuff, its usually black but when you engrave through it, a lighter colour, usually white is revealed to show the lettering, sorry.

If i cant get it i can see i will have to do the engraving, then get out the enamel paint and fill the grooves with white. (yuk.... not my fav idea but needs must)

Rick