Wood seems to be expensive... I can get something like this: 20' x 10' Shiplap Tongue and Groove Workshop Shed - Premium Range - Wooden Sheds for £1300, heavier duty than the £800 versions... but I'd still need to insulate it and at the end of the day it would need maintenance and the like.

Also would need upgraded windows etc. the £3500 I'm working to includes uPVC windows and door with 3point security deadlock (apart from the mill and lathe theres a few grands worth of bicycles etc.)

Hopefully I'll settle on a supplier for the panels tomorrow and I've also got someone coming to quote me on the base... already been quoted £790 for that which is about what I can buy the raw materials for!