So all thoses fines were for what exactly ?
According to the Metropolitan Police;
What we are doing
If there is a problem we want to resolve it by communicating clearly and encouraging people to behave responsibly.
We're following 'the 4 Es': Engage. Explain. Encourage. Enforce. First we will try to engage with someone, explain how we think they are breaking the rules, and encourage them to change their behaviour to reduce the risk to public safety and health.
If people still do not follow the rules the police can:
tell them to disperse
tell parents to stop their children breaking the rules
fine them
If someone continues to ignore the instructions, the police can arrest them if they think it is proportionate and necessary.