Have you tried
these guys? Several members have used them and they seem pretty good quality. Prices aren't bad either:
nose = 40 Euros
seat = 80 Euros
sides = 60 Euros each
So about 240 Euros for a whole set, or about 170 quid! You can get the nose with or without the headlight cutout. I think Antonye used them for this DD racer.