My usual guy is great but some of the others .................firing questions at you until they trip you up ......and they will because they live & breathe the regs But like Kerch & a few others ...I don't carry all this stuff in my head ....I know what is important , I know the everyday stuff ....I didn't need that lecture on isolating a circuit FFS after 100 years in the trade ......... anything else I have a £70 book I use to look it up . ( And a Forum)
Actually since the 17th edition kicked in .I have three £ 70 books and 300 On Site Guides . All we needed back in the day was The BICC Electrician's Mate booklet & a Letts Electrical Diary.