Hi mate, I've got one, it's needs a little work but you could have it for £80.. I'll upload a pic
Some of the gutter mounts have corrodes and not sure I have all of the clamps, but the rails are just 1/2" square bar ad the clamps are pretty easy to fabricate..
I live in derbyshire but work in Wolverhampton, could probably put it on the roof of the gaylander of you could get to Wolverhampton?