Below is an excerpt from the HN26 ''Christine Green' profile at the former Undercover Research Group wiki, which was last updated in 2018. A fuller profile will be published once the Inquiry hears evidence regarding HN26's deployment.
HN26 'Christine Green' was an undercover police officer who served with the Metropolitan Police's Special Demonstration Squad. She infiltrated animal rights groups in south and west London from early 1995 to late 1999 / early 2000, where she had succeeded the previous undercover officer, Andy Davey.
Christine was active in hunt sabbing, London Animal Action and national grassroots campaigns. She was arrested on at least one occasion though charges were dropped. Her cover name was constructed rather than stolen from that of a deceased child, being the first example of this being done by SDS undercovers.
Green left the police after her deployment as she had started a long term relationship with an animal rights campaigner who had been active in one of the groups she had targeted. The relationship continued for years, possibly to the present day.
In October 2013, suspicions that Christine Green was an undercover were publicly circulated, and publicly released by The Guardian and the Undercover Research Group in February 2018.
Two days later, the Undercover Policing Inquiry confirmed Christine had been a SDS undercover police officer, noting she was the person they had been referred to by the cipher HN26. The Metropolitan Police made an unusual and rare public apology to Hampshire Police over a 1998 raid by the Animal Liberation Front on a mink farm - confessing Metropolitan Police Special Branch had withheld the crucial information at the time.
This in turn caused Christine Green to come forward to The Guardian to make her own statement, highly critical of the Metropolitan Police's apology in the way it named her, among other things.