Years of discontent have erupted with Met police firearms protest

When it comes to investigating police shootings, what all sides agree on is it takes too long

The Metropolitan police's firearms command is seen as prestigious to serve in, but Louise Casey's damning report into Britain's largest force published in March found it had become dogged by cultural issues.

Some of its virtues can slide into vices. It is close knit, offering strong support for colleagues in trouble, which can turn into an insularity. It's members volunteer to face extreme danger, rarely open fire, and some can appear to sneer at those who question them, viewing it as doubting their professionalism.