Whoever own the property? Who else would be hiring them? If you do a shit job wiring up my new extension and sign it off with a trade body, then you're at fault if it shorts and burns the place down, meaning I can sue you.
If you are paying someone, yes. If you are doing it yourself in your own property, electrical is different.
Not really, you need to be "competant" to undertake any electrical work that is notifiable too.
@lynx started
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Whoever own the property? Who else would be hiring them? If you do a shit job wiring up my new extension and sign it off with a trade body, then you're at fault if it shorts and burns the place down, meaning I can sue you.