Seen all this before. They do it outside the Halfway House on the London-Southend road. You get all the wheelie merchants and silly buggers doing more and more extreme things, showing off outside a bike meet, then there are accidents and fatalities - it's only to be expected the police would want to calm things down. Also, saw it at (can't remember the name of the pub now) place on the Ongar road. Same thing, wheelies and showing off getting more extreme until someone was killed. That place got too much attention then, and is now closed down. And that meet had been going on for years, hosting an annual bike show/rally too.