Jagtar Singh Johal, a Sikh activist, is facing terror charges in connection with political violence in India.
Mr Johal was arrested in India in November 2017, weeks after his wedding there.
He claims he was tortured – an allegation the Indian authorities strongly deny.
His trial for the eight most serious cases against him started in 2022 but he still has not been convicted of any crime.
In May last year a UN panel of human rights experts found his detention was arbitrary – in other words lacked legal basis – and he should be released.
The Indian authorities have always maintained that due process is being followed in the case.
His brother Gurpreet Singh Johal has now written to David Cameron to ask for a meeting.
Lord Cameron is the sixth foreign secretary in power since Mr Johal’s arrest.
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