New Delhi: The Sikh Federation (UK) has urged UK PM Theresa May to put the record straight on the UK's role in the happenings in 1984 in Punjab pertaining to Operation Blue Star by ordering an independent public inquiry following further disclosures in Foreign and Commonwealth Office (FCO) files under the 30-year rule.

The Sikh Federation (UK) first raised serious concerns on limitations of the internal review by senior civil servant Sir Jeremy Heywood, commissioned by David Cameron in January 2014 even before it was published and presented to Parliament in February 2014 around three weeks after it was first commissioned.

The letter to the British PM from Amrik Singh, the Chair of the Sikh Federation (UK), states that despite a third of relevant files remaining withheld disclosures in FCO files from 1984 and 1985 "prove the internal review was at best inadequate and at worst a cover up." In February 2014 Heywood in a bid to downplay the situation concluded that the "military advice was a one-off". "This has now been shown to be untrue and Parliament and the wider public have been misled," the letter says.

The Sikh Federation has also pointed out to the Prime Minister that responses from FCO officials and Ministers in the last 12 months have been "totally inadequate" and further disclosures will continue to "create doubt, raise more questions and damage Sikh community trust in the full extent of the role of the British authorities in the 1980s."

"It would be unfortunate if we were forced to escalate the legal challenge and push this demand in Parliament when the House returns after the recess," the letter reads. The Sikh Federation (UK) has also claimed that it has cross-party political support and can count on the support of all Labour and SNP MPs.