Next door, the neighbours are having a loft conversion. A surveyor knocks on the door and asks if he can asses the attic to make sure it is safe.
With much argument and reluctance, Mike eventually lets the surveyor in. 


The builder opens the Attic door and hundreds of empty milk bottles fall out and onto his head.
Mike: Oh bloody hell.
Builder: Jesus christ! What on earth is all rubbish!
Mike: 'this rubbish' is our thermal insulation.