Jagtar Singh Johal, a Sikh activist, is going through terror prices in connection with political violence in India.
Mr Johal was arrested in India in November 2017, weeks after his wedding ceremony there.
He claims he was tortured – an allegation the Indian authorities strongly deny.
His trial for the eight most severe circumstances in opposition to him began in 2022 however he nonetheless has not been convicted of any crime.
In Could final 12 months a UN panel of human rights specialists discovered his detention was arbitrary – in different phrases lacked authorized foundation – and he ought to be launched.
The Indian authorities have all the time maintained that due course of is being adopted in the case.
His brother Gurpreet Singh Johal has now written to David Cameron to ask for a gathering.
Lord Cameron is the sixth international secretary in energy since Mr Johal’s arrest.
