OP
alarm man
Exactly. It was never intended to stop qualified employed electicians doing their own work, that was just a side effect. I can't see how you'd ever get in trouble for it. For a sparky who spends most of their time doing private domestic jobs its in their own interest to be registered to avoid the odd problem with building inspectors and because it looks more pro if you can put on yr letter head 'registered competent person'
If you're a qual'd spark whos not registered doing private domestic jobs the only thing you are doing is a minor breach of building regs, which any decent builder does on a regular basis.
ive never worried about it to be fair,and as far as i know no one as ever been up in front of the beak for not being part p as its known