The information requested is as follows.
(a) Figures on the number of people convicted under each category of terrorism offence from September 2001 to 2009 are available in the Home Office Statistical Bulletin 18/09—Operational of Police Powers under the Terrorism Act 2000 and Subsequent Legislation; Arrests, Outcomes and Stops and Searches 2008-09. This is available on the Home Office website via the following link:
The information includes those convicted of offences under terrorism legislation as well as under non-terrorism legislation for terrorist-related offences. Tables 1.10 (a) and 1.10 (b) illustrate the principal offences of which suspects were convicted.
(b) Information on the number of individuals convicted of terrorism offences involving the internet from 1998 is not available. Offences relating to the dissemination of terrorist material and the glorification of terrorist acts on the internet were introduced under the Terrorism Act 2006 Part one, sections 1 and 2.
Statistics preceding the Terrorism Act 2000, covering the period up to February 2001 are available in the Home Office Statistical Bulletin 16/01. This is available on the Home Office website via the following link:
This includes offences under the previous terrorist legislation, The Prevention of Terrorism Acts 1984 and 1989.