Cheers @Turkish if I could keep the rest of the build down to about £400 then I’d be happy - won’t be worried about leaving it around town too much but hopefully I can buy a few lighter bits to keep it sub 9kg.
Hydra wheel set is a good choice. Hard to find them second hand though atm.
Was thinking 1x also. I don’t know much about 1x setups. Is 1x11 most popular?