Jagtar Singh Johal has been detained since 2017 and allegedly tortured, accused of helping to fund assassination plot
The UK is under pressure to insist India release Jagtar Singh Johal, a British citizen, after a UN working group ruled he had been arbitrarily detained by India and his detention lacked any legal basis.
Boris Johnson apparently raised the case when he met the Indian prime minister, Narendra Modi, last month and provided a written note of consular cases, but Foreign Office ministers have not confirmed whether they regard his detention as arbitrary.