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You should do the training and exams. It's roughly 4-6 weeks to do BS7651 and Part P. That doesn't make you an electrician but it gets you started on what's involved. It's probably about £2k (oddly).
** You still won't be allowed to do your own garden electrics without getting it signed off by building control and ** you'll no longer be able to claim ignorance if anything goes wrong!
edit ** you can carry out your own garden electrics without building control sign off **
Unless you need to add a new circuit.
IMO let anyone do it, and those who can't install and test competently can still hire electricians. To be fair, part P hardly covers anything now. But enforce the law severely if anyone, electrician or not, doesn't follow BS7671 to the letter. Competence instead of credentialism.
On a related note, how does one become an electrician? I am a software engineer working in the energy sector anyway. I have been thinking about starting a company installing smart home systems with custom software and being a qualified electrical installer would be handy.