Some years back I had a small problem with the flushing part of my bathroom loo. Opposite to that door, was the door to my home office, which had all sorts of equipment in it.
Anyway, I (stupidly), with a day off work for this, arranged for a mobile phone only man who called himself a plumber to come, rather than wait for one recommended by the Water Board, but who could not come until much later that day.
As soon as this man arrived at my front door I took a dislike to him, not sure why - gut reaction. He thumped up my stairs (cream carpet) still wearing his dirty shoes.....then asked me to go back down to turn off the water!!! Plumbing in this house was rather strange and I had no idea where I could turn off the water for that loo - and neither did he. Managed it eventually - with me having to go up and down my stairs!!! Whilst he was checking this, I was trying to go in and out of my office, but my gut reaction was not to let him see the expensive equipment there, (this was still the days before laptops but had tower desk computer, plus other items, so was only opening door to that as little as I could squeeze through,
Then he told me that the part would cost about a hundred pounds and he could go and purchase it now if I would give him the cash!!!! Told him I did not carry cash in the house and would pay when he showed me the invoice.
Somehow, he got it into his head that this was something like a rogue trader set up.....me sneaking in and out of that room opposite,. Even to the degree that he was putting the loo tank back together, he swore, looked up and then said'sorry Lady'. Then he raced downstairs, into his white can and drove off as fast as possible.
Did then what I should have done in the first place. Got in reputable plumber, who did not need water turned off at all, took photo of the damaged part on his phone and that went to his supplier. Came back a couple of days later with this and fixed it - all paid for by proper invoice from his company., and for just over half the cost that man had wanted just for the part.
He laughed when I told him what had happened, and said he hopd that it given that man a fright as he was obvioulsy a rip-off cowboy.