Get those on a regular basis....Just like the idiot 'GAS SAFE' guy i asked to connect, test and sign off my F G fire--....
"I've bought a (whatever) and just need someone to stick it in...."
Or even worse:
"I have/me brother has/my mate who knows all about this has installed my (whatever), and I just need someone to hook it up and sign it off...."
The obvious reason they got some reject from fleabay flung in by some spectard, is that in essence they are small-minded, skin-flinting red-knob-owners who will happily spent a whole day getting the last possible tenner off the price and think they are really clever.
They get the "sorry can't help you" before they finish the first sentence from me, and from every other quality RGI.