Did it really take you two years to compose that?
I will take issue with some of your points.
There absolutely is a requirement for any electrical alterations, beyond changing a lightbulb, to be carried out by a qualified electrician.
Absolute rubbish. Domestic electrical work can be carried out by anybody. The only requirement is that it must be done safely.
Creating a new circuit within an existing installation would require a Minor Installation Works Certificate, to be kept with the original installation certification (which is often not present but nonetheless a requirement of BS7671 and, I assume, home insurance providers). The certification must be produced by an electrician with the appropriate testing and inspection qualifications.
creating a NEW circuit, and other larger works such as changing a consumer unit, would require an INSTALLATION CERTIFICATE and would have to be notified to the local authority. Works such as modifications to an existing circuit does not need notification.
All this work does not need the god-like attention of a qualified electrician. The average competent DIYer can carry out most electrical works in their own home.
You are contending that even a simple task, must be done by a fully qualified electrician. Wrong.
Anybody can carry out most works. This includes items such as changing a couple of light switches or replacing a fan, or adding a spur to an existing circuit to power a new socket.
I grant that any electrical work should
be properly tested. Bs7671 (a non-statutory document) recommends that a test certificate is produced to record the tests carried out. This can be done by the DIYer with the appropriate test equipment. Again, there is NO requirement for an certificate (full EIC, or MWC) to be carried out by “by an electrician with the appropriate testing and inspection qualifications”.