It is not just the mega money which hurts though, but the fact that they have done a lousy job and, as often as not, you only find out the next time something goes wrong, when you are asked: "Who did that then? Right cowboy!" And you discover a saga of shortcuts and bad practice.
Example: Bunched up newspaper round an exterior flue, where it is supposed to be cemented into the wall. The plumber, a nice chatty chap with whom I talked rates for the job and to whom I said that he was earning more than the prime minister, replied with a degree of smugness "Is that so?"
More recently and more dangerously, electric shocks from the kitchen sink in our French cottage. The cause eventually discovered - a cable running the length of the back garden to a shed. The cable totally unsuitable for outdoor use and an inch below the surface!
I don't know what the French call cowboys but they sure have them too!