Thanks to the guys who posted the links but there doesnt appear to be anything local to me (Milton Keynes). I have decided to try and make some out of painted MDF. I had a large sheet of MDF in the garage, left over from some other project. Bought some MDF primer and black gloss paint yesterday. I have given them a couple of coats of primer and it looks OK sof far. Next step is the gloss. If that doesnt work then I will have to make a trip to the local dump !