Haha, ...a Real funny guy, ...well still trying to be anyway... lol!!
Exactly, so you have never heard of the 5/4 week wonders and now the 17 day Wizz kids, that can go on these short courses, get the 17th edition C&G, (and that's all they have, unless you count PAT testing as an appropriate qualification for an electrician) approach a Part Pee scheme provider pay there fee and bingo, he's a competent person, that can now go into peoples homes and undertake any electrical work in that home!!!! So are you getting the picture NOW, or do you Still have your head up in the clouds??
Most sensible DIY'ers wouldn't ever attempt a CU change, Part re-wire, full re-wire, but will be more than capable of adding/moving a socket outlet(s) to a circuit, or replacing accessory plates etc, etc. Fact is you'll never be able to stop a DIY'er, they will always find a way around any legislation that tries to stop them improving there home. If he's daft enough to go meddling beyond his abilities, in any area, not just electrical work, that's his concern, not yours, mine or anyone else's.... By the way, as far as i know, ''The Electricity at Work Act 1989'' applies to places of employed work, Not anything a DIYer would be doing in his own home. The clue lies in the title of the Act!!!