London Mayor Boris Johnson on the Andrew Mitchell row:
"In my book you shouldn't abuse police officers and I made that clear loads of times. The crucial thing for me is that Andrew Mitchell has now apologised not just once but twice publically. I believe he's also apologised to the officer concerned."
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Around 60 firefighters tackled the blaze at the four-storey building in Daleham Gardens, Hampstead, that broke out early on Tuesday.
It is the fourth time in five years that the London borough has topped the rankings, according to data from the ONS.
Catherine Burke's body was discovered at a house in a quiet street in Muswell Hill last Thursday evening.