KRW Law, which is representing Sikh Federation (UK), sent its "pre-action protocol" letter for a judicial review in the case to the UK Foreign and Commonwealth Office (FCO) this week. It follows an earlier request by the group for a public inquiry being refused and the process could now end up in the UK High Court.
"The fact that military assistance was provided in the run up to the Amritsar Massacre (sic) is a matter of significant public concern...It is plain that to address public concern about what did or may have happened, a full inquiry needs to take place into the events of 1984," the letter notes.
"This remains a highly sensitive issue and release of the information could have a detrimental effect on our relationship with India," said Owen Jenkins, former FCO Director for South Asia and Afghanistan, at the First Tier Tribunal hearing in London today.
Much of his evidence and that of Philip Barton, FCO director-general (consular and security), was given in a closed session due to the "sensitivity" of the material which they said could cause "risk of damage" to international relations.
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Miller is trying to establish that Freedom of Information (FOI) has historical significance to establish if trade and arms deals were a factor in the assistance offered to India by the then Margaret Thatcher-led UK government.
The UK government has claimed that the documents cannot be viewed entirely in a historical context as they have real implications on politically sensitive issues of today.
Jenkins told the tribunal that nearly 92 per cent of the material had already been made public under the 30-year declassification rule.
However, Miller's research indicates that this figure refers to a very limited set of documents from the Prime Minister's Office files, whereas a vast set of UK Cabinet Office files dating between 1979 and 1985 remain entirely secret.
The then prime minister David Cameron had immediately ordered a review into this discovery, which led to a statement in Parliament declaring that Britain's role had been purely "advisory" and advice by the Special Air Service (SAS) had "limited impact".
Miller's FOI request for further documents related to that period was turned down by the UK Cabinet Office, a decision upheld by the UK's Information Commissioner in 2015.