Hi Folks
Thanks for the replies
Made a few enquiries viz. RS & Farnell's with not much luck.
Decided to try using my PCB designer ( Express PCB ) to do a top layer design then put it onto the translucent acetate sheet followed by laminating it.
The whole lot under a 2 or 3mm acrylic sheet .... bit clumsy but I have all the gubbins to do it.
If it makes an unholy screw-up I've not lost much.
Dave