The noise which I think my hon. Friend has in mind is due, not to thebrakes, but to the transmission; and he is mistaken in thinking that it could easily be avoided or rectified. I recognise that this noise might at first be mistaken for the beginning of an air-raid warning, but it could give rise only to a momentary misapprehension for, unlike the air-raid warning, it does not rise and fall and does not last for two minutes.