Looked extremely like a park in Hackney, the area that the police posted that they were fighting a losing battle trying to clear. It's in the link I attached.
And yes you are making it up; because nowhere does that film footage show anyone going home; it follows no-one to their front door. They will appear to clear up, walk a little way in the opposite direction & set up again. If the police stop to directly deal with one family, the issuing of the tickets & paperwork will buy everyone else half an hour in the sun. If one lot refuse details then the police either walk away or they arrest them, which takes them out of the park for the rest of the day, buying the whole park a free one. If you want to stop that, you go down mob handed, clear the entire park in one sweep, post bodies at the entry points & have a few roving patrols inside to catch anyone that's bunked in over the fence. I know this first hand.
If you think what you saw in that video was a park being successfully cleared then you really do not have a clue as to how this sort of thing works.