This resonates.

I have a really good electrician on my contacts list. He's an individual, not a gang; he's really good, and takes all the annual training and then some; and his client list includes some very classy organisations.

But he can't recommend a builder to me.

Nor a plumber; but I have an OK plumber. It's a firm, not an individual, and I've had people rock up that were rather arrogant. But nobody incompetent has turned up. Oh, and they're pricey.

But they can't recommend a builder to me either.

People have told me to use a service such as TrustaTrader. But I don't trust them; they take payment for listing.