An undercover police officer posing for years as an environmental activist co-wrote a libellous leaflet that was highly critical of McDonald’s, and which led to the longest civil trial in English history, costing the fast-food chain millions of pounds in fees.

The true identity of one of the authors of the “McLibel leaflet” is Bob Lambert, a police officer who used the alias Bob Robinson in his five years infiltrating the London Greenpeace group, is revealed in a new book about undercover policing of protest, published next week.

McDonald’s famously sued green campaigners over the roughly typed leaflet, in a landmark three-year high court case, that was widely believed to have been a public relations disaster for the corporation. Ultimately the company won a libel battle in which it spent millions on lawyers.

Lambert was deployed by the special demonstration squad (SDS) – a top-secret Metropolitan police unit that targeted political activists between 1968 until 2008, when it was disbanded. He co-wrote the defamatory six-page leaflet in 1986 – and his role in its production has been the subject of an internal Scotland Yard investigation for several months.

At no stage during the civil legal proceedings brought by McDonald’s in the 1990s was it disclosed that a police infiltrator helped author the leaflet.

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