Back in 2018 I had great difficulty in getting an electrician, though eventually I found a very good one, self-employed. He sorted out the initial problem quickly. As a result I discussed with him an upgrade and he did that and various other jobs for me, and did it all excellently, clearly having an ethos of doing a good job and providing good customer service.
Before finding him though, I rang one and he had an answerphone and although I rang on several days I never got any response, so I gave up.
Another one was a "We have electricians in your area" one rung at just after 9 am and they quickly booked me in for an electrician to arrive by 1 pm.
They rang back at around 10 am very apologetic. It appears that they did not "have" electricians, they had independent contractors on their list. Apparently the man lived some distance from me, and had taken the line that, for the job, which was basically small, he wasn't willing to travel that distance.
Another one was a business advertised under electricians and I rang and a man answered. What did I want doing? I explained, in detail. He said "I'll ask the electricians to see if they want to do it". "Aren't you an electrician?" "No, I'm a plumber, I just answered the phone as I was nearby". I heard no more from them.
Another one, advertised on the web as something like "You know how some electricians let you down, we don't" and so I rang them. "Oh we don't do your area anymore."
But as I say, I found a good one and he came promptly.
He also got other work as someone I know asked if I knew of a good electrician.