HN355 was an SDS undercover officer who infiltrated Maoist groups in the late 1970s and early 1980s. No further information is available beyond that provided in a combined (and censored) statement by SDS officers who gave evidence in closed hearings, and brief details given in their application for anonymity.
HN355 said they were deployed into Maoist groups for 4 years in late 1970s and early 1980s.
HN355 made the following brief comments about their life undercover:
Day to day I would attend meetings, help at jumble sales and demonstrations.
I did not have any sexual relationships during my deployment. I was never arrested, charged, prosecuted or appeared in Court either as a Defendant or as a witness. I only ever committed fly-posting.
On 28 April 2018, Mitting said he was minded to restrict both cover and real names, which he confirmed on 3 July 2018.
Unusually, the reason was that HN355's child was active politically, and was also 'mentally unstable' - and therefore reliant on their relationship with HN355. The revelation of HN355's job as an undercover officer was said to 'damage gravely...or destroy' that relationship.