Unlike police-reported crime in the UK, the methodology of the CSEW has remained largely unchanged since its inception in 1982. The
Office for National Statistics (ONS) therefore regards it as the most reliable source of long-term trend information. However, it fails to capture 'high-harm' crime effectively. This is because such crimes (e.g., gun crime,
attempted murder) occur relatively infrequently compared to theft or
burglary, thereby producing an insufficient sample size. The methodology of the survey also prevents it from capturing certain other categories such as homicide, since the victim cannot be interviewed, and so-called 'victimless' crimes such as drug or weapon possession, are not covered. This data therefore comes exclusively from the police. The CSEW does not include non-household populations (approximately 1.7% of the population in England and Wales according to Census 2021), so excludes all victims living in care homes, prisons, student halls of residence, or the homeless - groups which likely experience crime differently from the household population. The CSEW has also not surveyed fraud and computer misuse before 2017, which may comprise as much as 40% of all crime in the UK as of 2025. It is also thought that both the youth and the adult surveys do not distinguish between crimes not reported to the police because they thought the police would do nothing, or crimes not reported to the police because the victim thought them too trivial. Until 2019, the survey restricted victims' reports of the same crime by the same person and same victim to a maximum of five. The ONS argued that this 'cap' prevented a small number of victims distorting the statistics. In 2007, a report into the survey's methodology estimated that this resulted in an 82% increase in crime from that reported in the year of the study, although it would not necessarily affect overall trends. In 2010, the existence of the cap was also blamed for the inability of the survey to take proper account of crimes such as domestic violence, figures for which would allegedly be 140% higher without it. In 2015, a similar study found that domestic violence against women rose by as much as 70% if the cap was removed. In response to these criticisms on the five report limit, the ONS greatly increased this - setting it to a 98th percentile figure with all historic data revised to the new methodology in 2019. It cautioned that while this did not affect the overall trends, it did produce a small effect on the absolute numbers, with increases in violent offence types between 6.4% and 31.6%. This was due to repeat incidents being more common for those crimes. In 2022, there was a temporary suspension of
national statistics status for the data from the CSEW, primarily due to concerns about low response rates for face-to-face interviews. This led to several improvements in the way the survey was published, as well as leading to the introduction of a part of the survey in which respondents completed their own description of their experiences in order to better record domestic and related crimes. ==Data access==