Metropolitan Police Service
The incident took place on Monday during a police patrol in Romford.
Stott was carried away by four officers on Sunday night. The Metropolitan Police say more than 1,000 people have now been arrested.
The group hopes to negotiate with the Mayor of London and Metropolitan Police to agree specific areas where demonstrators can remain.
At least 750 people have been arrested since Monday, in what the Met called an "unprecedented" operation.
The boat was dismantled several hours after Dame Emma Thompson used it as a stage to rally protesters.
Police have spoken to a 16-year-old girl who reportedly baked them.
"Peaceful protest has a long, rich history in Parliament Square. Sad to see this action taken."
Protesters chanted "we are peaceful, what about you?" as officers arrived.
Police used firearms and Taser before arresting a man, who is in his 40s.
Stepping out into a society that is so suspicious of your blackness feels dangerous. It feels hostile, ostracising. It is a society where you are always a suspect and where you are constantly on trial.