Sean O'Neill – For 30 years Maureen Tolfree has suspected that the British Government lied to her about the death of her brother, Malcolm Rennie.

The release of the Foreign Office documents has whetted her appetite for more disclosures so that she knows the full truth about the deaths of Brian Peters and his colleagues.

Mrs Tolfree, 60, wants other papers blocked by the Cabinet Office to be released in time for an inquest into her brother's death to be held in Sydney in the new year.

"I have won a victory by persuading the Australians to hold the inquest but it is very important now that that hearing is given access to all the relevant papers," said Mrs Tolfree, 60, from Bristol.

"These documents prove that my family has been lied to, that everything has been covered up and hushed up. But truth will out and we know there is more to come."

Mrs Tolfree is also campaigning for the exhumation of bodies in a grave in Jakarta to establish if they really are those of her brother and the other journalists.

Don Foster, Liberal Democrat MP for Bath, will table parliamentary questions about the extent of the Government's knowledge of the deaths of the Balibo Five this week. He said: "There is clear evidence that the British Government was complicit in a cover-up of the facts of the deaths of British journalists. The public has a right to know what happened."

Mrs Tolfree was only four years older than her brother but had been his guardian since their mother left them when he was 11. She said: "That's why I fight for him. I was the one who gave him permission to emigrate to Australia and I've always had that guilt on my shoulders."