The Boy With The Topknot, 9pm, BBC2

BASED on his memoirs, this one-off drama follows Sathnam Sanghera, (played here by both Sacha Dhawan and Himmut Singh Dhatt, pictured) a second-generation Indian living and working in London, as he goes home to Wolverhampton to tell his traditional Punjabi parents that he’s marrying a white girl — only to be floored by a startling discovery.