For doing site work on heavy plant, I used to use a set of Aldi metric spanners and a socket set/torque wrench.
Really good quality and put up with all sorts of abuse . No hardship if you lost one either as they were cheap as chips to replace
Heard good reports about Halfords Advanced Pro tools as well
Arwyn
Thanks Arwyn, I'll go with Halfords as they are local and have stock.