I appreciate this is quite a specialist question!
I get different answers from different people, so wondered if anyone has any actual experience where they or a family member is an electrician who is not JIB registered but still gets plenty of work? Or definitely not.
Although he is colour blind and fails the ishihara test, he can see different wire colours in real life. And has been working as an electricians mate on a weekend with no difficulties.
But this would mean he wouldn't be able to register with JIB down the line.