Question to the Home Office:

To ask the Secretary of State for the Home Department, which police forces record the (a) sex and (b) gender of perpetrators of sex offences.

It is an operational matter for the police to determine what relevant information should be recorded to assist in their investigation of individual crimes.

Home Office statisticians work with the Office for Statistics Regulation (OSR) on the quality of data from the police. The OSR have issued guidance on the collection and reporting of data about sex in official statistics which informs on-going conversations the Department has with policing partners on the issue of data:

https://osr.statisticsauthority.gov.uk/publication/draft-guidance-collecting-and-reporting-data-about-sex-in-official-statistics/

Information is not held centrally on which police forces record both the sex and gender identity of the perpetrators of sexual offences.