i didn't think it was that big a deal re regs etc. the only reg. i'm aware of is the one about the cooker switch must be accessible.
Cooker switch must be minimum of 300mm from the hob's edge and 300mm from edge of sink. No sockets or accessories above the hob - switches to be minimum of 150mm above worktop.....to name but a few.
You might be better off buying a diy domestic electrical handbook or the electricians guide to the building regs to get an idea of some of the complexities of the building regs and BS7671.
Then make a decision as to whether you feel confident to diy or get someone in to do it for you.