These are the 'official'crime figures for London for the financial year 2007 - 2008:

http://www.met.police.uk/crimestatistics/2008/2008_yend.xls

You wouldn't be far off if you multiply the figures by 5-10 times across certain crimes because most people don't report the crime.

Yes, London may have a 'good\ nightlife or some nice attractions but lets not neglect the facts that crime is high..I think 1 murder is too much but hey maybe 156 murders in London last year is ok for some or 2000 reported rapes is something people can live with etc but for me this truly defines that London and like most of the western world, it is on the decline.

And you may not be affected by crime whilst visiting but it is increasingly likely that you will.. Therefore be extra cautious whilst in London or any other western city.

Then again, it so safe that they really don't need all the thousands of CCTV which captures you about 300 times a day.