I have some qualifications (a number of years ago) in this arena and even though I've never worked professionally in the field I am perfectly capable of working to current regulations.
Any opportunity to avoid unnecessary cost in my view should be taken....
Maybe speak to your local LABC and ask their opinion. I have a feeling they'll tell you that notification is required though.
Have you got a copy of or have access to BS7671:2008 (17th edition wiring regulations)? You'll need to reference this to work to current regulations.