Hello -

A relative has a small outbuilding that needs a general overhaul of its
electrical wiring, and I'm wondering if it could be DIY'd without coming
under Part P.

It's basically a small steel-framed barn that houses a couple of cars and a
couple of horses. There's no wiring in the horses' part. It's fed by a short
buried cable from the consumer unit in the house, which feeds a smaller
consumer unit in the barn. Things which need to be addressed include:
- Most of the sockets and switches are old, some are cracked. Some may be
exposed to rain during severe weather.
- A family of swifts has built a nest on top of the barn's consumer unit,
which needs to be replaced.
- Presumably the earthing requirements need to be looked at, particularly in
view of the amount of earthed steel around.
- I want to fix whatever needs fixing, but this would just be a repair
operation, not a sneaky extension or enhancement.

I have done lesser electrical tasks before, I have a physics/electronics
background, and am prepared to buy specialised testing kit. If I read up on
all the regulations and best practice, is this legitimately DIYable without
falling foul of Part P?