Here is a wee list to start you off.
Footprints (monument) 7" and 9" (approx £16)
Knipex alligators 180mm and 250 mm (£30)
Pipeslices 22mm & 15mm (PTS £12 pair at moment)
Couple of shifters or bahco's (£6-30)
Decent 10" through tang plain screwdriver to be used for anything you need to screw, hit, dig, cut (£5)
Feather splitter (eclipse £6 or 7)
Wood chisels (£15)
Screwdriver set plain and pozi various sizes (£10- 15)
20oz hammer (£5-50)
Crawfoot (monument £20)
Box spanner set (£8)
Junior hacksaw (£3)
Big hacksaw (£7)
Pipe cutters (monument, rothenberg, ridgid £15 - 35)
Cold chisels (get the blacksmith to make you some, the ones you buy are generally shyte £30)
4lb hammer (you'll get used to it £10)
1/2" spring (£2)
8m tape (£5)
Stanley knife (£7)
Immersion key (£7)
Quickfire gas torch (£50)
Rad tail key (£3)
Boat level (£6)
14volt battery drill (bandq warehouses are selling AEG's for £54)
and hundreds of other things
Look up the tool catalogues.
Monument Knipex Rothenberg Ridgid CK Irwin Stanley etc and fill yer boots with dreams