Any work carried out in a special location, such as kitchens and bathrooms. Garden lighting and sockets. Any work to an existing circuit that requires a change of the protective device. The installation of a new circuit. Change of a consumer unit, and of course a full rewire.
Probably a few I have missed that im sure the others will pick up on.
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc