Base time.

I wanted the shed to have as large a capacity as possible. This ment a thin but strong concrete base.
Before any concrete went in we lined the bottom with 2 strips of chicken mesh. I thought this would make it less likely to develop any cracks.
We used some stuff from J B Little Woods in Sutton Scarsdale. I purchased a 50m x 1m roll for under £50. I wasn't going to use this much but the stuff always comes in handy. This shop is great for all sorts of bits and bobs such as nuts and bolts, garden tools and steel supplies. They also sell wooden posts weed killer etc. Prices great.
Next we made a wooden tamp out of some old timber. This was made so it would hang down of the gravel boards and guarantee a good level finish.
Now we were ready to start mixing. 5 parts lime stone 1 cement measured in buckets to ensure accuracy.  We had decided to hire a cement mixer and it was a good job we did. Mixing over 2 ton on a board would have taken a huge effort and the result would never be as good. It only cost £8 for the day, bargain. The mixes ended up quite sloppy and we had to add water sparingly.
The loads were barowed into the base and we just had about enough to get a good covering. As the loads went in we used the tamp to compress and level the concrete. You have to take time and care with the tamp working a bit leveling and then scraping. The surface was the floated up to smooth finish.
Before leaving the base to set we sheeted it down with a trap incase it should rain.