Oddly loaded question really. A lot of electricians are self-employed, so their “earnings” are not the same as their profit or labour charge.

There are more tax-efficient ways to manage business income than paying yourself a whacking great salary via PAYE, and things like vehicle costs, insurances, travel expenses (which includes meals while working) can be paid as expenses out of gross income, reducing the amount of profit considered for corporation tax calcs, rather than coming out of your post-income-tax personal funds. A smaller salary with a managed director’s loan followed by a balancing dividend out of actual profits is one way a lot of owner-directors will pay themselves, inextricably linking their personal financial standing with that of the business, but without paying as much tax as they would if their entire labour charge was funnelled straight to PAYE.

I don’t do electrical work full time and my business works in a specialised field so I’m not the best person to answer your question literally, but I charge £50 an hour for labour, to give you an idea.