That is a good example, another 1, a customer of mine just moved into new house and I did some work there I then found a leak on a old boiler he said he has just took out boiler cover as he new the boiler was old...good idea, he rings b.g and the engineer comes out the next day an says the boiler isn't right, a few little not to current standrd things although the boiler is 17 years old. Then he realises he has just took the contract up an says he is not going to change the part as he new he was trying to take them for a fool, which he wasn't. It's not like the b.g engineer was paying for the part or effecting his profit/wages in the end the engineer was nasty and trying to sell a new boiler so the customer literally threw him out, and complained to which he has had the part done now and some discount. That is a jobs worth