Darwen is a bit of a trip for me and I haven't got a van any more. Thanks for the offer though.
I have started pricing up and have found a supplier local to me that has agreed to let me have some 'damaged' corrugated plastic for half price per sheet and he has more than what I need.
Just finishing the design and deciding on wood or steel, I'm starting to favour wood as It will go together a lot quicker and when I move if I don't need it anymore I can dispose of it in my wood burner