When to DIY and when not to DIY

[Dirkie]

Despite all the information I have gathered, I still feel unsure of where the red line is for DIY projects. As I understand no new circuit is allowed without the presence of a qualified electrician, but am I still allowed to replace my own faulty wall sockets and light switches?

I think I have found the answer to my own question, and it is no, you are not allowed to change a broken wall socket or light switch. Hopefully someone who knows better can confirm. According to the Explanatory notes on the Electrical Installation
Regulations, 2009:

"electrical contractor" means a person who undertakes to perform electrical
installation work on behalf of any other person, but excludes an employee of
such first-mentioned person;

"installation work" means -
(a) the installation, extension, modification or repair of an electrical
installation;