[5] The film was produced by Harrelson and Ken Kao of Waypoint Entertainment, while Fathom Events assisted in the live production.

But it is a brilliant technical and logistical achievement, especially from a first-time director previously known for comedy and character roles, and a hippyish devotion to marijuana.

"[12] In The Daily Telegraph, Tim Robey found, "It went alright on the night, with no hideous glitches", adding that, "Breaking new ground with this live experiment was only a matter of time, and single-take gambits of its ilk have been dabbled in for years.

Robey praised Harrelson and Owen Wilson's trading of insults, before concluding, "[…] the film lurches to a halt more with relief that it's crossed the finish line than with anything you'd call an elegant climax.

But we did watch the boundaries crumble outright between live performance and real, on-the-hoof film-making, to amply entertaining effect.

"[13] Ryan Gilbey, reviewing the film for The Guardian, noted that, "Actors who try their hand as a director typically start off with something small-scale—a sensitive coming-of-age story, say, such as Jodie Foster's Little Man Tate or Robert De Niro's A Bronx Tale.

"[14] Lost in London was favourably reviewed on BBC Radio 4's Front Row on 20 January 2017 by Jason Solomons, who previewed it the evening before.