Use all the cheapest stuff available, can do materials for a grand.I don't know how these electricians are making any profit on £3K full re-wires , there is just no margin in that price
The last 3 bed re-wire I did pretty basic re-wire just lights and sockets ( no data , no outside power , no car charging point) I think I ended up spending around £1600-1700 just on gear alone maybe a bit more
£3k would leave me about 2 days to do all the work , it just wouldn't happen
I took 7 days and was knackered by the end , 6 to do the re-wire and day 7 to all the testing and paperwork etc
£2k, pay the other lads £120 a day apiece and keep the rest. Fudge paperwork etc.