The London universities in the top 40 are:
- Imperial College London (ranked 10)
- University College London (ranked 21)
- London School of Economics and Political Science (ranked 32)
- King's College London (ranked 38)
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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.