It is based on the life of Harry Hallowes who successfully claimed ownership of a half-acre plot of Hampstead Heath.

[4] The film stars Diane Keaton, Brendan Gleeson, James Norton, Lesley Manville, Jason Watkins, Hugh Skinner, and Simon Callow.

The story is based upon the real life events surrounding Harry Hallowes who first squatted on the site in 1987 after being evicted from his council flat in Highgate.

Hallowes, who died aged 80 in 2016, battled for the legal rights to own the land on which he had built his shelter arguing that he had gained ownership by adverse possession.

The website's critics consensus reads: "Hampstead plays matchmaker with a pair of talented veterans, but the sum of their efforts isn't enough to overcome a deeply mediocre story.