ZERO tolerance seems to be the attitude of Britain's senior policemen to the notion that they should listen to America's most effective police chief, Bill Bratton.

零宽容似乎是英国高级警官对于自己竟然要听从美国最给力警官比尔·布拉顿这一做法的态度。

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Current legislation prevented Bill Bratton, former head of New York police, applying to take charge of the Metropolitan Police in 2011.

BBC: Police officers, Bristol

Even Bill Bratton himself said in 1998 that "zero tolerance is neither a phrase that I use nor one that captures the meaning of what happened in New York City".

BBC: Could we tolerate zero tolerance?

And for that part of the session he will be joined by US policing guru Bill Bratton, former Chief of Police for Los Angeles and former New York City Police Commissioner.

BBC: Viewing guide: The coming week's highlights in Parliament