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Leslie Michael Grantham (30 April 1947 – 15 June 2018) was an English actor who played "Dirty" Den Watts in the BBC soap opera EastEnders. He was a convicted murderer, having served 10 years for the killing of a West German taxi driver, and had significant press coverage resulting from an online sex scandal in 2004.
| Year | Title | Role | Notes |
| 1985 | Morons from Outer Space | Motorway Policeman's Assistant | |
| 1989 | The Nightwatch | David Smallman | Television film |
| 1991 | The Grove Family | Bob Grove | Television film |
| Waiting for Godot | Estragon | ||
| 1992 | Gummed Labels | Terence | Television film |
| 1995 | It's Not Unusual | Cabbie | Short film |
| 1998 | Shadow Run | Liney | |
| Crow's Nest | Mr. Shaw | ||
| 1999 | The Bench | Max | Television film |
| 2000 | The Wedding Tackle | George | |
| 2001 | Lava | Aladdin | |
| 2004 | Charlie | Richard Waldeck | |
| 2011 | Dead Trust: Prequel | Dobson | Short film |
| 2012 | Deadtime | Mr. LaRoux | |
| Acceptance | Ronnie | ||
| 2013 | The Factory | Gene | |
| Leslie | Leslie | Short film | |
| 2016 | Mob Handed | The Detective | |
| 2018 | Jack Southeast | The Boss | |
| The Krays: Dead Man Walking | Nipper Read | ||
| 2020 | Search and Destroy | Anderson | |
| Touching the Blue | Max Langton | ||
| Vengeance | Ronnie | Final film role |
| Year | Title | Role | Notes |
| 1979 | Minder | Policeman | Episode: "Gunfight at the O.K. Laundrette" |
| 1982 | BBC2 Playhouse | Bookie | Episode: "Jake's End" |
| 1983 | Goodnight and God Bless | Frank | Episode: "Little Green-Eyed Monster" |
| 1984 | Doctor Who | Kiston | Episode: "Resurrection of the Daleks" |
| The Jewel in the Crown | Signals Sergeant | Episode: "The Moghul Room" | |
| Dramarama | Mo's Dad | Episode: "Night of the Narrow Boats" | |
| 1985 | Screen Two | Peter | Episode: "Knockback" |
| Bulman | Alan 'Dodger' Tait | Episode: "The Name of the Game" | |
| 1989 | Winners and Losers | Eddie Burt | Miniseries; 3 episodes |
| 1989–1990 | The Paradise Club | Danny Kane | Series regular; 20 episodes |
| 1992 | Woof! | Mr. Flint | Episode: "Police Dog" |
| The Good Guys | Nick Toth | Episode: "Horseplay" | |
| 1993 | Comedy Playhouse | Roland Jackson | Episode: "Wild Oats" |
| The Detectives | Danny Kane | Episode: "Strangers in Paradise" | |
| Cluedo | Colonel Mustard | Series regular; 6 episodes | |
| Runaway Bay | Lou Hardy | Episode: "Radio Daze" | |
| 1994–1995 | 99-1 | Mick Raynor | Series regular; 14 episodes |
| 1995 | The Good Sex Guide | Episode: "Jeremy Hardy Gives Good Sex" | |
| Woof! | Patrick Garrett | Recurring role; 5 episodes | |
| 1985–1989, 2003–2005 | EastEnders | Den Watts | Series regular; 563 episodes |
| 1996 | Delta Wave | Rex Valentine | Episode: "Dodgy Jammers" |
| Saturday Live | Mission Impossible Brief | Episode: "Series 3, Episode 6" | |
| 1997 | The Uninvited | Philip Gates | Miniseries; 4 episodes |
| Wycliffe | Patrick Durno | Episode: "Dance of the Scorpions" | |
| 1998 | The Bill | Jimmy Smith | Series 14; Recurring role; 4 episodes-“Good Faith” Parts 1, 2 & 3 (Episodes 27, 28 & 29) and "The Personal Touch” (Episode 117). |
| Noel's House Party | Barman | Recurring role; 4 episodes | |
| 1999 | Bernard's Watch | Mr. Rattle | Episode: "Ending Time" |
| 2000 | Urban Gothic | Lenny's Dad | Episode: "The Boy's Club" |
| The Stretch | Terry Greene | Miniseries; 2 episodes | |
| 2001 | Gypsy Girl | Car Dealer | Episode: "Episode 6" |
| 2002 | Heartbeat | George East | Episode: "The Great Ming Mystery" |
| 2007 | The Bill | Jimmy Collins | Episode: "The Good Old Days" |