I asked for a quote from them to replace my (15 year old) boiler (which they installed 15 years ago) Everything went pear-shaped when they happened to discover that the boiler sits on an asbestos plate. (Said plate was there 25 years ago when we moved into the house and which the installers cut to size, by scoring it and snapping it! to fit under the replacement)
They said it would cost me GBP1600 just to have the plate removed and a certificate supplied, BEFORE they would even attempt to install a new boiler. Despite a legally-worded letter suggesting they at least pay for it to be removed because they haven't met their duty of care to me as a customer, they are adamant the plate is part of my house (!) and so my responsibility.
Needless to say I have terminated my long-standing service contract with them and got a independent installer to give me a better price on supply and installation. And a quote for removing the plate from a registered asbestos remover? (GBP160)
(I should also say that the actual engineers who come to do the servicing have always been professional, courteous and pleasant - I have no issues with them)