I work for a roofing merchants (www.burtonroofing.co.uk/) and get staff discount on lots of top quality building products, so the build is slightly cheaper than normal.
I will try and keep this post updated with costs.
This is what i think ill need to get the restoration kickstarted.
Red treated 2×1 timber, i think about 12 meters should do
at least 2 sheets of 2mm ply 2400 x 1200
stanley stapler/nail/brad nail gun £20
sticky backed plastic