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Cheers, had a go and it looks like it'll do the trick. Does anyone have any experience avoiding a damp shed? Current on is wooden sitting on a few blocks, frame surrounded by a weatherproof membrane but it's still gotten pretty bad after a decade.. Plan for the new one is to pour a concrete base and run a course of bricks, on which the new wooden frame will sit. Should I have ventilation top and bottom? Is insulating it going to make a difference?
Osktranot-
Losing all of those plants would help. Otherwise, it looks like a shack that has a lot of gaps for falling and driven rain to get in.
If you're going wood on brick, I'd consider a DPC - between the brick and soleplate at least.
Ventilation is not a panacea for damp getting in - although it does help.
It's mostly for dispelling damp from inside - breathing, cooking, washing etc...
As you're (I'm guessing) not heating the shed, having some air bricks at the bottom and vented soffit / eaves / however you do the roof isn't exactly going to burn fuel though.
The general approach is to stop water / damp getting in, and have a way for any that does get in to get out.
NotThamesWater
I've done all of my planning on sketchup - they have an online version.