The more observant out there will have wondered how the shed walls I built were going to stay up. 4inch screws into the base might hold the bottom but would soon fail if nothing was done at the top. To overcome this I installed M10 nuts, washers and thread in 3 locations at each corner and tightened. No chance of these walls coming apart now!
I’m afraid the pics kinda skip some of the next steps 
I cut the rafters, ridge etc for the roof and screwed on top of my walls. End result is this, you can also see that I’ve installed some of the noggins in the walls and made a start on boarding the inside with marine ply:
With base structure finished I screwed more exterior play to the roof and then covered with roofing paper:
The final roofing cover is going to be asphalt shingles from Wickes. In this pic I’ve made a start on installing the edging:
