UK Threat Level Changes to the UK national terrorism threat level, from MI5 https://cheltenham-od.uk/cheltenham-security-alerts 2026-04-30T06:09:00Z UK threat level: Severe https://cheltenham-od.uk/cheltenham-security-alerts#2026-04-30 MI5 The current national threat level is SEVERE. The threat to Northern Ireland from Northern Ireland-related terrorism is SUBSTANTIAL. 2026-04-30T06:09:00Z UK threat level: Substantial https://cheltenham-od.uk/cheltenham-security-alerts#2024-03-06 MI5 The UK national threat level was set to Substantial. 2024-03-06T00:00:00Z UK threat level: Substantial https://cheltenham-od.uk/cheltenham-security-alerts#2023-03-28 MI5 The UK national threat level was set to Substantial. 2023-03-28T00:00:00Z UK threat level: Substantial https://cheltenham-od.uk/cheltenham-security-alerts#2022-03-22 MI5 The UK national threat level was set to Substantial. 2022-03-22T00:00:00Z UK threat level: Substantial https://cheltenham-od.uk/cheltenham-security-alerts#2022-02-09 MI5 The UK national threat level was set to Substantial. 2022-02-09T00:00:00Z UK threat level: Severe https://cheltenham-od.uk/cheltenham-security-alerts#2021-11-15 MI5 The UK national threat level was set to Severe. 2021-11-15T00:00:00Z UK threat level: Substantial https://cheltenham-od.uk/cheltenham-security-alerts#2021-02-04 MI5 The UK national threat level was set to Substantial. 2021-02-04T00:00:00Z UK threat level: Severe https://cheltenham-od.uk/cheltenham-security-alerts#2020-11-03 MI5 The UK national threat level was set to Severe. 2020-11-03T00:00:00Z UK threat level: Substantial https://cheltenham-od.uk/cheltenham-security-alerts#2019-11-04 MI5 The UK national threat level was set to Substantial. 2019-11-04T00:00:00Z UK threat level: Severe https://cheltenham-od.uk/cheltenham-security-alerts#2019-07-23 MI5 The UK national threat level was set to Severe. 2019-07-23T00:00:00Z UK threat level: Severe https://cheltenham-od.uk/cheltenham-security-alerts#2018-03-01 MI5 The UK national threat level was set to Severe. 2018-03-01T00:00:00Z UK threat level: Severe https://cheltenham-od.uk/cheltenham-security-alerts#2017-09-17 MI5 The UK national threat level was set to Severe. 2017-09-17T00:00:00Z UK threat level: Critical https://cheltenham-od.uk/cheltenham-security-alerts#2017-09-15 MI5 The UK national threat level was set to Critical. 2017-09-15T00:00:00Z UK threat level: Severe https://cheltenham-od.uk/cheltenham-security-alerts#2017-05-27 MI5 The UK national threat level was set to Severe. 2017-05-27T00:00:00Z UK threat level: Critical https://cheltenham-od.uk/cheltenham-security-alerts#2017-05-23 MI5 The UK national threat level was set to Critical. 2017-05-23T00:00:00Z UK threat level: Severe https://cheltenham-od.uk/cheltenham-security-alerts#2016-05-11 MI5 The UK national threat level was set to Severe. 2016-05-11T00:00:00Z UK threat level: Severe https://cheltenham-od.uk/cheltenham-security-alerts#2014-08-29 MI5 The UK national threat level was set to Severe. 2014-08-29T00:00:00Z UK threat level: Substantial https://cheltenham-od.uk/cheltenham-security-alerts#2012-10-24 MI5 The UK national threat level was set to Substantial. 2012-10-24T00:00:00Z UK threat level: Substantial https://cheltenham-od.uk/cheltenham-security-alerts#2011-07-11 MI5 The UK national threat level was set to Substantial. 2011-07-11T00:00:00Z UK threat level: Severe https://cheltenham-od.uk/cheltenham-security-alerts#2010-09-24 MI5 The UK national threat level was set to Severe. 2010-09-24T00:00:00Z UK threat level: Severe https://cheltenham-od.uk/cheltenham-security-alerts#2010-01-22 MI5 The UK national threat level was set to Severe. 2010-01-22T00:00:00Z UK threat level: Substantial https://cheltenham-od.uk/cheltenham-security-alerts#2009-07-20 MI5 The UK national threat level was set to Substantial. 2009-07-20T00:00:00Z UK threat level: Severe https://cheltenham-od.uk/cheltenham-security-alerts#2007-07-04 MI5 The UK national threat level was set to Severe. 2007-07-04T00:00:00Z UK threat level: Critical https://cheltenham-od.uk/cheltenham-security-alerts#2007-06-30 MI5 The UK national threat level was set to Critical. 2007-06-30T00:00:00Z UK threat level: Severe https://cheltenham-od.uk/cheltenham-security-alerts#2006-08-13 MI5 The UK national threat level was set to Severe. 2006-08-13T00:00:00Z UK threat level: Critical https://cheltenham-od.uk/cheltenham-security-alerts#2006-08-10 MI5 The UK national threat level was set to Critical. 2006-08-10T00:00:00Z UK threat level: Severe https://cheltenham-od.uk/cheltenham-security-alerts#2006-08-01 MI5 The UK national threat level was set to Severe. 2006-08-01T00:00:00Z