block 'shed' (which may end up better insulated than my house)

Thanks yeah, I think I'm just weirdly lazy as in would rather start digging a big hole than to hire and then figure out how to get a digger all the way to back/top of garden haha (or just a cheapskate). Nowhere near as spacious as yours but should be sweet once done, will definitely be needing some tidy organiser stuff like you have made to make the most of it!