Watch the cctv and the black car which exits to the left hand lane but does not quite leave the box.
Leaving aside the moral question of whether a car minding its own business & not causing any delay to anybody should be sent a ticket, Barnet Council thought the driver (car owner receives it) deserved one (or perhaps just their computer did even though Mr Mustard is assured that all cctv is checked by a person before issuing a PCN, an assurance which he doesn't have much faith in) the question is
'Was a contravention committed?'
Here are the Regulations:
The prize for getting this correct is that you won't get PCNs in the future (mean Mr Mustard!).