Question to the Home Office:

To ask Her Majesty’s Government how many people suspected of committing offences relating to terrorism have been held in pre-charge detention and subsequently convicted of the offence for which they were initially detained.

The Home Office collects and publishes figures on the number of people arrested under Section 41 of the Terrorism Act 2000, by the period of detention and subsequent outcome (e.g. charge, release). This data can be found in table A.01 and A.02 of the Home Office Quarterly Statistics Bulletin on the operation of police powers under the Terrorism Act 2000 and subsequent legislation. The most recent bulletin, published on 15 December 2016, covers the period to the end of September 2016: www.gov.uk/government/statistics/statistics-on-terrorism-arrests

The document is also attached to the response.

The Home Office does not, however, hold this information for other terrorism-related arrests, made under Schedule 7 of the Terrorism Act 2000 (Port and Border Controls). Nor does the Home Office hold information on individuals detained under the Police and Criminal Evidence Act 1984, for offences that are known to be terrorism-related.

In none of the cases does the Home Office hold information on whether those arrested were subsequently convicted for the same offence that they were initially arrested for.