How Many Builders?

You might recall we've been having trouble with the boiler cutting out, several times since we moved in. Despite quite a few parts being replaced under the warranty, nobody could find anything wrong with it. When it went off on Monday they thought it was the condenser pipe being blocked, so the boiler won't fire.... so we had to get the builders to check the pipe.

Straight away they worked out there was a blockage not in the pipe, but in the drain. So they had to check the drain from the other end. Turns out the drain was blocked under the road, although nobody was aware of that. So looks like my heating is going to go off whenever the drain gets blocked. Nice planning there, Taylor Wimpey....