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Foreign Secretary William Hague is set to inform parliament today about Britain's alleged involvement in planning Operation Bluestar to flush out militants from the Golden Temple in 1984, with Sikh groups criticising the probe conducted by the government.
Hague will update MPs on the extent of then Prime Minister Margaret Thatcher's involvement in helping plan the army operation that left more than 1,000 people.
Prime Minister David Cameron ordered the probe after documents released under a 30-year declassification rule stated an officer of the elite Special Air Service travelled to Delhi and advised the Indian government as it framed plans for removing the militants in February 1984.
Sikh groups in the UK criticised the scope of the inquiry into Britain's alleged role in Operation Bluestar.
In a letter to Cameron, Sikh Federation UK chairman Bhai Amrik Singh said: "We are dismayed the terms of the review were only formally made available almost three weeks after the review was announced and only days before an announcement of the results of the review are expected in Parliament.
"It appears the review has looked at a narrow period and not covered the period in the latter half of 1984 and may not have addressed some of the concerns raised by UK politicians in the last three weeks, eg threat of sanctions by India against the UK, Germany, Canada and US towards the end of 1984 for sympathising with Sikhs in the Diaspora."
Two letters released from the National Archives in London, both marked "top secret and personal", revealed details of the advice given to Indian authorities by the SAS.
One document, a letter from then Foreign Secretary Geoffrey Howe's private secretary to his counterpart in the Home Office, warned that the operation could trigger tensions in Britain's Indian community, "particularly if knowledge of the SAS involvement were to become public".
It is unclear whether the plan referred to in the documents was used by the Indian government.
A few months after Operation Bluestar, then Indian Prime Minister Indira Gandhi was assassinated by her Sikh bodyguards in an apparent revenge attack.
