When Mum and Dad drop plumbing-mad schoolboy Ben off to stay at his granny’s for the evening, he expects the usual, boring old cabbage soup, never-ending knitting and endless Scrabble with his equally boring grandma.

Until one day, Ben’s granny tells him an incredible story ... she was once known as the ‘Black Cat’, a notorious international jewel thief.

Together they go on a wild adventure to complete the one heist she never quite managed in her criminal heyday – to break into the Tower of London, and steal the Crown Jewels.

Gangsta Granny airs on Wednesday, 24 December at 20:35 on BBC Entertainment, channel 120 on DStv.