Having checked, the report states it is only for Regulated flights, and only for flights where the CFMU gets a DEP message or an Activation Message from the departure aerodrome.
The latest report is for February and it seems that Manchester Airport are now consistently the 'bad boys' in the UK with a slot violation rate almost double that of Heathrow (they were showing a similar level difference % wise in January also). Looking on the bright side, there's a few Turkish ones which are consistently even worse ;-)