Tricky Dicky wrote:

This may add to the expense unless you can borrow one but using a
screwdriver with a torque setting ensures you get all the terminal
screws correctly tightened. As I was adding the last circuits to my
garage CU I checked the ones I had done a couple of weeks before and
they were still spot on. If you have to buy one Toolsatan do a Draper
for £65 which is probably the cheapest around.

if you only need one or two torque settings, wiha sell adapters at
various ratings, about £25 each.