I've been ind for 16 years, I agree with coljack in the respect that a lot of the domestic stuff doesn't apply as with industrial we don't have part p, the industrial sector has been regulated a lot longer by the HSE (EAWR etc) and where I am is a lot more tightly regulated.
This is possibly what caused the tightening up of the strings by the government by introducing part p as where I work we would never allow work on electrical systems by someone who isn't competent to do it, even to the extent of not allowing a non-electrically qualified and appointed person to even replace a plugtop fuse.
At work we don't use T&E at all, it is all SWA, pyro, steel conduits, YY, metvin etc.
It still complies with BS7671 but is quite good in the way that it still complies with the current version of the regs even though a lot of it was installed early 1980s, a lot of thought must have gone into it by the designers at the time.