First Minister Nicola Sturgeon has called on Foreign Secretary Dominic Raab to meet the family of a man held in an Indian prison for four years.
Jagtar Singh Johal, from Dumbarton, is being held under India’s anti-terror laws, accused of conspiring to murder a number of right-wing Hindu leaders.
Mr Johal has previously said via his lawyer he had been “falsely implicated” and tortured into making a confession.
Ms Sturgeon said she was concerned about his detention without trial.
In her letter, she also said she was “deeply concerned” about allegations of torture and mistreatment of Mr Johal while in custody.
The Indian authorities strongly deny the allegations and have said “there is no evidence of mistreatment or torture as alleged”.
Mr Johal travelled to India from Scotland in October 2017 for his wedding.
Videos of the occasion show the new groom jumping enthusiastically to Bhangra music as he celebrated.
But a fortnight later, while on a shopping trip with his new bride in the North Indian state of Punjab, Mr Johal was taken away by police and has been in detention ever since.
His brother Gurpreet, who lives in Scotland, says Mr Johal was a peaceful activist and is convinced he was arrested because he had written about historical human rights violations against Sikhs in India.
Gurpreet Singh Johal met Ms Sturgeon earlier this month to ask for her support.
The first minister’s letter to Mr Raab said Gurpreet was disappointed with the support from the Foreign Office and that he could not get a meeting with the foreign secretary.
Ms Sturgeon asked Mr Raab to “personally” meet the family of Mr Johal to hear their concerns and provide assurances of adequate assistance.
She also asked him to raise the allegations of torture and the importance of a fair trial with the Indian authorities.
Gurpreet Singh Johal said he last spoke to his brother, who is being held in Delhi’s maximum-security Tihar jail, about three weeks ago.
He said Mr Johal was in “good spirits” but was concerned about the delays to his case.
Gurpreet Johal said he was grateful to finally meet Ms Sturgeon after his brother had been detained for almost four years.
Of the UK government, he said: “It is disappointing that a British national is being detained in an Indian jail for 1,380 days and they have still not called for his release.”
It is claimed Mr Johal was a member of Khalistan Liberation Front (KLF), described in the documents as an international “terrorist gang”.
He is accused of paying £3,000 to the former head of the KLF to help fund the crimes. The documents claim he “actively participated and had complete knowledge of the conspiracy”.
“There are very serious charges against him including murder and abetment of terrorism,” an Indian government official told the BBC.
“The seriousness of charges against him have been shared with the British authorities,” they added.
Mr Johal has been represented by the human rights organisation Reprieve since last year.
