Tom Watson, the Labour lawmaker from West Bromwich East, said the documents released under Britain's 30-year rule included "papers from Mrs Thatcher authorising the SAS (Special Air Service) to collude with the Indian government on the planning on the raid of the Golden Temple".
The government apparently "held back" some more documents and "I don't think that's going to wash", he told BBC Asian Network.
He wrote on his website that he would write to the Foreign Secretary and raise the issue in the House of Commons to get a "full explanation".
"But trying to hide what we did, not coming clean, I think would be a very grave error and I very much hope that the Foreign Secretary will...Reveal the documents that exist and give us an explanation to the House of Commons and to the country about the role of Britain at that very difficult time for Sikhism and Sikhs," he added.
Five months after Operation Bluestar, Gandhi was assassinated by her Sikh bodyguards in retaliation for the raid on the Golden Temple.