| Jon Hamm | Matt Trent |
| Rafe Spall | Potter |
| Oona Chaplin | Greta |
| Natalia Tena | Jennifer |
| Janet Montgomery | Beth |
| Rasmus Hardiker | Harry |
| Dan Li | Tim |
| Ken Drury | Gordon |
| Zahra Ahmadi | Gita |
| Verity Marshall | Amy |
| Ian Attard | Dawson
(as Ian Keir Attard) |
| Grainne Keenan | Claire
(as Gráinne Keenan) |
| Robin Weaver | Holder |
| Simon Nock | Fenn |
| Diveen Henry | Fola |
| Esther Smith | Madge |
| Beatrice Curnew | Surgeon |
| Jonathan Arkwright | Bloke at Bar |
| Liz May Brice | Gainsborough |
| Nicholas Agnew | Mungo |
| Gavin Kean | Desk Sergeant |
| Sukh Ojla | Market Woman |
| Leanne Li | May |
| Magnus Robertson-Jones | Baby May Double |
| Beatrice Robertson-Jones | Older May Double |
| Raphael Sowole | Nixon |
| Turlough Convery | Stingray |
| Samuel Valentine | I_AM_WALDO |
| Matthew Aubrey | El Nino |
| Muzz Khan | Fappuccino |
| Daniel Kendrick | Pie Ape |
| Paul Blackwell | Police Officer
(uncredited) |
| Richard Cullen | Police Officer
(uncredited) |
| Susan Hughes | Pub Patron
(uncredited) |
| Jassie Mortimer | Karaoke Pub Customer
(uncredited) |
| Ricky Rajpal | Party Guest
(uncredited) |
| Neil Alexander Smith | Tall Man at Bar
(uncredited) |