Does anyone have a link to the data (which is only mentioned once in the article).
It seems these figures were "obtained by BBC" through FoI request, not part of normal Met Police data sets.
http://www.bbc.co.uk/news/uk-england-london-39328233
Here's an older FoI request, but it might not be the one the BBC are talking about: https://beta.met.police.uk/globalassets/foi-media/disclosure...
UK crime statistics come in two forms.
1) Police records, which is what this article is talking about. In general these are not seen as statistically robust because they rely on people reporting a crime to the police, and the police recording it. Police forces have improved their recording in recent years.
Here's a link to the Met Police stats: https://beta.met.police.uk/stats-and-data/
Here's a link to press release: http://news.met.police.uk/news/crime-statistics-for-2016-to-...
2) Office for National Statistics. These use a crime survey, and are seen as reliable.