The 7 July 2005 London bombings prompted the government to update the threat level system following a recommendation from the ISC that it should deliver " a greater transparency of the threat level and alert systems as a whole , and in particular it is recommended that more thought is given to what is put in the public domain about the level of threat and required level of alert . " The system was accordingly simplified and made easier to understand . Since 2006 , MI5 and the Home Office have published international terrorism threat levels for the entire UK on their websites , and since 2010 they have also published threat levels for Northern Ireland , with separate threat levels for Northern Ireland and the rest of the UK
7 July 2005 London bombings
7 July 2005 London bombings
UK Threat Levels