I see on the Sky News article that this is based on a population of "...2.6 million home insurance quotes..." in which "...people have made claims for theft or burglary on their home insurance during the past five years."

My conclusion is that this survey might be a little flawed. For example, if I have just moved to SE23 and apply for a quote and I was burgled in, say, Willesden Green in the last five years then SE23 gets the "tick" rather than NW10.