Isn’t that just some noise from the skip lorry passing by? It certainly gets louder as it approaches and then fades as it passes.
I don’t think it’s that. You hear it again at 0:44 and then when the cyclist appears to thump the cab at 1:20 there’s a very similar noise. Then at 1:35 another similar noise, which—given that the driver appears in shot a couple of seconds later—could well be the driver’s door shutting: something which would have a broadly similar effect on an internal mic.
Could be something else making the noise, of course. I’d just be rather cautious about assuming that this video’s the whole story. Might be, might not.
Anyway, where’s Ronnie Pickering when you need him, eh?