but he will have to provide test certificates after the work is complete to prove it is safe.
His dad is good at rewiring, although not certified etc. Some of the jobs he has done on his own property in France are perfectly serviceable. He is confident it will be safe.
Just because a light goes on and off it does not mean a instalation is safe
tbh he may well appear to be good but, wiring kit in and knowing what to use are two differant things for example
How is the house earthed is it TT,PMS or PME whichever system it is dictates wether or not a earth spike is required because the shed is outside the earth protected bonding zone according to BS7671 (17th edition wiring regs)
I am not trying to be a smart arse but I am trying to make you aware