Well there’s a lot of useful things that 100 pounds can get you. Depending on what you consider incredibly useful, and what you do everyday. A quick list of the top of my head:
good quality first aid kit
old/new but shit smartphone
pair of decent working boots
shit ton of used clothes (atleast where I live, idk about the UK), to wear or as fabric
set of screwdrivers and bits
cheap drill, or good used drill
used laptop
used oscilloscope
used all kinds of electronics really; TVs, displays, audio stuff
Well there’s a lot of useful things that 100 pounds can get you. Depending on what you consider incredibly useful, and what you do everyday. A quick list of the top of my head: