You can order a copy of the 17th Edition Regulations, as well as other publications from here
Wiring regulations - The IET
The Wiki page shown in a previous post does give informatin about domestic installations (Part P Building Regulations), but for more commercial, industrial works, Part P does not apply. I would suggest contacting the JIB (Joint Industry Board) to obtain details on the requirements on obtaining an electricians trade card.
You would also need to possess a Skillcard. This is to show that you are fully conversant with health and safety legislation and practices.
Some of the H&S legislation
Health & Safety At Work Act 1974
Electricity At Work Regulations 1989
RIDDOR 1995
LOLER 1998
PUWER 1998
I'm not saying you would need to know these word for word, but you would need a basic knowledge of them. I think that these are free to download from the Health & Safety Executive website
HSE: Information about health and safety at work