HN300 is the cipher given to a former Special Demonstration Squad undercover officer deployed from late 1974 to January 1977, into the Socialist Workers Party. His cover name may have included 'Jim' or 'Jimmy'. He is is deceased.
- For the N cipher system see N officers page.
As an SDS officer
According to the Undercover Policing Inquiry it is not known what branch of the Socialist Workers Party he was deployed into. His cover surname has not been discovered. During deployment told another undercover that he had fallen in love with a member of his target group and had divorced from second wife in 1979. A gisted note from the Inquiry provides the following:
- During his deployment, another SDS UCO recalls being told by HN300 that he had fallen in love with one of his target group and wanted to disclose to her that he was an undercover officer. HN300 was withdrawn from the field. HN300’s family from his second marriage confirmed that he met his third wife whilst deployed on the SDS and that she sometimes referred to him as ‘Jimmy’. They had a child. This third marriage also ended in divorce. The woman then moved overseas in the 1980s and it has not been possible to contact her. It is understood that she has remarried.
In the Undercover Policing Inquiry
- 11 January 2018: directions issued for any application for restriction orders to be submitted by end of January 2018.
- 29 January 2018: Metropolitan Police Service make application to restrict real identity.
- 7 March 2018: 'Minded To' note stated that HN300's second wife and two children had provided a joint statement about their experiences during his deployment and the impact disclosure of his real name may have on them. Mitting indicated that on the grounds that publishing his real name would interfere with their rights, he would grant the restriction order over it. Though, if further information on his cover name becomes known to the Inquiry it will be published.
- 15 May 2018: ruled that HN300's real name will be restricted in the course of the Inquiry.
- Sir John Mitting, In the matter of section 19(3) of the Inquiries Act 2005. Applications for restriction orders in respect of the real and cover names of officers of the Special Operations Squad and Special Demonstration Squad - 'Minded To' Note 5, Undercover Policing Inquiry, 7 March 2018 (accessed 10 March 2018).
- Gist of additional information in respect of HN300's application for restriction order over real name, Undercover Policing Inquiry, 4 April 2018, published 9 May 2018 via ucpi.org.uk.
- Applications for restriction orders in respect of the real and cover names of officers of the Special Operations Squad and the Special Demonstrations Squad: Directions, Undercover Policing Inquiry, 11 January 2018.
- Open application for a restriction order (anonymity) re:HN300, Metropolitan Police Service, 29 January 2018, published 9 May 2018 via upci.org.uk.
- In the matter of section 19 (3) of the Inquiries Act 2005 Applications for restriction orders in respect of the real and cover names of officers of the Special Operations Squad and the Special Demonstrations Squad: Ruling, Undercover Policing Inquiry, 15 May 2018.