After speaking to some electicians this doesn't seem to be the case. One said that it only applies to new buildings or extensions. However, from what it says it doesn't seem to suggest that it is only for new buildings.
What I actually need to do is add a spur for a new cooker hood (in the kitchen). It is a pretty simple job. What would the best way be to get this job done? I believe that notification will probably cost around £67 (minimum charge)? So an electrician (that can self certify) may not actually be much more than that? I could do all of the work myself, so could an electrician just inspect our work, or could we groove the wall out etc and just let the electrician connect the wires?
A family member has actually done most of the work already (without my consent) telling me that it is legal because he's asked an electrician. I'm not sure what I should be doing now. Nobody I know seems to understand these new regulations, how long would it take if I gave notice? Would it be a few weeks before I had permission to start the work?