Firstly, like all politically sensitive statistics, crime figures are manipulated. The police use a variety of techniques to do this. This was widely reported on about 10 years ago. Here's an old BBC article that talks about this:
https://www.bbc.co.uk/news/uk-25002927 and there's a longer report (written by a former Chief Inspector) here:
https://www.civitas.org.uk/content/files/ATangledWeb.pdf I think things have improved since then but there are still problems.
More importantly, those are
reported crime figures so they don't mean much in terms of what's really happening. A lot of crimes aren't reported because people are becoming more and more aware that the police don't do anything when you report crimes. I have personal experience of this. I had a bag stolen in a bar a few years ago. The bar had CCTV cameras and offered to give the police their footage that clearly showed the thief's face when he went up to the bar as well as him stealing my bag and walking out of the bar. The police did nothing for weeks, and only went to collect the footage after the bar had very kindly badgered them, but they then closed the case a day or two later. If something similar happened today I wouldn't waste my time reporting it unless I needed a crime reference number for insurance purposes. Some surveys have suggested that only 4 in 10 crimes are actually reported.