You could try looking in B&Q or some other hardware store, or failing that look in the yellow pages for a local Extrusion moulding company and talk to them nicely.

Or you could always try these:
http://www.componentforce.co.uk/categor ... fAod0XfXLQ
for a free sample asking for a piece acouple of metres long, saying that you need to test it for going round a corner.
Jack.