A three-day hearing of the First Tier Tribunal (Information Rights) will open in London on Tuesday to determine if the UKs Information Commissioner was right to uphold a Cabinet Office decision not to allow the files being made public.
The appeal is being handled by KRW Law on behalf of freelance journalist Phil Miller, who has been investigating the exact nature of the then Margaret Thatcher led governments assistance to the Indian Army operation on Golden Temple in Amritsar.
In 2014, UK government documents declassified under the 30-year rule to make such material public had revealed that British military advice was given to Indian forces prior to Operation Blue Star.
The then British Prime Minister, David Cameron, had ordered a review into this discovery, which led to a statement in Parliament declaring that Britains role had been purely advisory and the Special Air Service (SAS) advice had limited impact.
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A public inquiry would allow us to understand how much Margaret Thatcher's decision to send a military adviser to Amritsar in 1984 was motivated by trade and arms deals worth billions of pounds. It would also establish whether the UK military advice was really a one off or whether in fact it continued throughout the period, even after the tragic events of June 1984, he said.
The UK Cabinet Office has declined to release the files on the grounds of national security and safeguarding international relations with India.
The UKs Information Commissioner, who was referred the case in August 2015, supported the Cabinet Office position.
An appeal over that decision was lodged in September 2016 and was to be heard in April last year but was delayed and will now begin on March 6.
Last year, Labour leader Jeremy Corbyn wrote to Prime Minister Theresa May, calling for an independent inquiry and his party has since included the issue as an election pledge in its manifesto for the June 2017 General Election.
There has been a massive cover-up and Parliament and the public have been disturbingly misled. An independent public inquiry to get to the truth is the only way forward, said Bhai Amrik Singh, chair of the Sikh Federation (UK), which has been campaigning for an inquiry.