
From a firm that does PVC cladding, guttering etc - I think they come from Portsmouth somewhere, but I should think if you look for fascia cladding etc in the yellow pages you can find a place near you. You need to get some right-angle bits as well for the corners, and small bolts.
I got some rail-holders from our local diy place to hold the pig-rails in, which we made out of small-bore PVC pipe, but of course you could still use broom handles.
Jo and the Casblaidd Flatcoats