A solicitor acting for the family of a British man held in Pakistan on terror charges is writing a second letter to Tony Blair calling for his intervention.
Tariq Mahmood was arrested in Islamabad
Tariq Mahmood, 30, from Birmingham, has been detained for six weeks by Pakistani authorities without being charged.
He has made several court appearances over the last four weeks and the authorities say he is being held under Section 10 of the Security of Pakistan Act on suspicion of being associated with a "banned organisation."
Solicitor Natalia Garcia, acting on behalf of Mr Mahmood's family, said she was disappointed at the Foreign Office's response to the situation.
"We are saying to the Foreign Office that we've got a British citizen who has been held for six weeks, who has been allowed no consular access in a country where we know people are tortured, and there has been no intervention.
"The Foreign Office is just accepting the Pakistani authorities' actions in stalling the case."
Ms Garcia said the authorities were claiming Mr Mahmood was not entitled to consular access because he has dual nationality, yet he was born and raised in England.
"I've already written one letter to the prime minister asking for his help, but I've had no response so I'm writing a second one," she said.
The British Foreign Office said it was pressing the Pakistani authorities for consular access.
Mr Mahmood's wife and two children returned to their home in Sparkhill, Birmingham, following his arrest.
They said they had been in Pakistan for the past two years while Mr Mahmood tried to settle a long-standing family land dispute.
A spokesman for Pakistan's Ministry of Foreign Affairs said Mr Mahmood was being questioned about possible links with militants inside and outside the country.
He said Mr Mahmood, who is believed to have moved to Pakistan from Birmingham three years ago, was in the custody of the Pakistani security agencies.