The government relies on the national Crime Survey to provide statistics about crime levels but it doesn't really provide the full picture about crime levels and we should not believe the government when it tells us that crime is falling despite the huge drop in police numbers since 2010.
From the BBC - "The Crime Survey of England and Wales says that traditional crime is broadly static at just over six million offences in the year to December 2016. When you add to that experimental data on cyber and fraud, it comes to 11.5m crimes.
There are holes in the CSEW that are difficult to fill - it doesn't cover all types of victims and all types of offences and only recently began asking people about fraud and computer-related crime. But, broadly speaking, it's considered to be a good measure of the long-term trends.
At the same time, police recorded crime has gone up to 4.8m offences - a rise of 9% - and it has seen rises in both serious violence and "traditional" offences such as burglary and robbery."
Professor Tim Hope says "the Crime Survey for England and Wales (CSEW) is neither a survey of crime (it doesn’t cover much of it), a survey of victims (it doesn’t include all of them), nor a survey of victimisation (it doesn’t measure enough of it). In fact, the CSEW is much better at not measuring crime than it is at measuring crime’s true extent, which is no doubt why policy-makers have come to rely upon it so much."
Richard Garside also thinks the Crime Survey should not be relied upon "The CSEW, for instance, is shot through with omissions and methodological weaknesses that belie its status as a 'gold standard' in relation to crime trends.
The experience of domestic violence, for instance, is not captured well by the CSEW, while sexual violence is not measured at all. Violence experienced by women, children and young people, vulnerable adults, those in institutional settings, the homeless, migrants, the poor and marginalised are variously not measured at all, or done so only very partially.
Add to this the methodological problems with data collection and the CSEW begins to look pretty ropey. Those who have experienced most violence are far less likely to be interviewed for the survey, if only because they are going to be less inclined to invite a complete stranger, however friendly, into their home for a one to two hour interview involving the sharing of a lot of potentially sensitive and traumatic experiences.
The total figure for violence in the CSEW - 1,537,000 in the latest report - is reassuringly precise. It is worth remembering that it is an estimate based on the experiences of around 36,000 people. This is a relatively large sample size. It remains, though, an estimate."