(replying mainly to bump into the first page so others with more knowledge than me can see it)

As I understand it there's no legal or wiring regs requirement to hold any particular qualification to be a domestic electrician - you're merely have to be "competent" to it (and competence can be achieved in may ways, including undocumented experience and self study).

The tricky bit comes when registering with a competent persons' scheme - as they have their particular requirements (seemingly centred on some suitable Level 3 qualifications these days) - often along the lines of this: https://electrical.theiet.org/media/2762/eas-21_482-rev-b-eas-qualifications-guide-december-2021.pdf but there may still be some variation between one scheme and another. You don't have to join a scheme though - it's perfectly legal to do even notifiable work without being a member - although the alternative (either pre-notifying via local Building Control or using someone who is registered to notify for you (through the Third Party Verifier scheme) can incur quite high per-job costs, so it may well not be economic if you're planning to do lots of notifiable work each year. Many customers do like the reassurance of employing with a suitable "badge" as well.

   - Andy.