Gangsta Granny is a British comedy-drama television film based on David Walliams' 2011 children's comedy fiction book of the same name.

Ben (Reece Buttery), who is 11 years old and lives in Basildon, visits his paternal grandmother's (Julia McKenzie) house every Friday afternoon while his parents go out dancing.

Granny suffers a fall and is found to be terminally ill. Ben helps her escape from the hospital and the plan for the heist continues.

Florence's mother Kelly (Jocelyn Jee Esien), enraged that Ben ruined the contest for her daughter, throws a shoe which hits Flavio (Robbie Williams) and knocks him out.

After Mr Parker fails to thwart the heist by tipping off a policeman (Steve Speirs), Ben and Granny are escorted by the police to the Tower.

In front of the Queen, Granny claims that the jewellery in her box is plastic and that she had made up the story when she had realised how boring Ben thought she was.

Ben reads at his local newsagent's that a jewellery box worth millions had been anonymously left at a charity shop.