Some short answers.
London certainly has a widespread problem with knife crime, gangs, drugs and more - the roots of which can be seen coming from immigration. Many of the offspring, let alone their parents, are now British-born and hold UK citizenship. I don't know any stats, but 95% of all murders in London are detected - the Met's Commissioner on BBC TV last week.
Locally firearms-related incidents have dropped off, with fewer fatalities, instead the preference is for "punishment" injuries and very few ever complain officially.
Nationally the prisons have a higher number of non-white (often called BME officially) inmates.
There have been numerous references, said with pride - except for a few - that London's population is now 40% non-British born. That does not mean non-white as the last ten years have seen large French (500k mainly in London & south-east) and Polish (1m plus across the UK) communities arrive. It has been reported, mainly using polling, that "new comer" communities are more loyal to Britain than the indigenous!
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