You know how the NHS reduced waiting lists a few years back? If you had waiting lists of say 100 for a surgery, they basically said - the list is maximum 15 people, after that it's whoever books first who gets the surgery. So basically you had to be lucky and be the number 15 on the list once a spot was open.
But! Magically NHS waiting lists got shorter! The government could say this on Question Time on the BBC, woohoo!
I imagine this is the kind of thing that's happening now with petty crime reports.