| 2010 | THE HABIT OF ART | Matt | Nicholas Hytner | National Theatre and Tour | |
| 2006 | TRUE WEST | Austin | Kathrin Sievers | English Theatre, Essen | |
| 2006 | MACBETH | Macduff/Duncan | Kathrin Sievers | English Theatre, Essen | |
| 2005 | FAUSTUS | Pope/Duchess | Chris Jamba | Etcetera Theatre | |
| 2004 | THE EMPEROR OF THE EAST | Theodosius | Vivien Heilbron | The Globe (Workshop) | |
| 2003 | THERE | Derek | Janette Smith | Royal Court |
| 2004 | FINGERSMITH | Policeman | Aisling Walsh | Sally Head Productions |
| 2006 | THE TRAGICAL ADVENTURES OF HEINRICH VON KLEIST | Reader | Angela Hind | BBC R3 | |
| 2005 | GAWAIN AND THE GREEN KNIGHT | King Arthur/ Servant 1 | Jeff Capel | BBC R4 | |
| 2005 | MURDER BY THE BOOK | Colin | David Blount | BBC R4 | |
| 2003 | SCENES FROM PROVINCIAL LIFE | Fred | David Blount | BBC R4 |
| 2010 | CHECK YOUR AVIATION ENGLISH | Voice-over | Ian Harker | Macmillan Education | |
| 2009 | RICHMOND ESSENTIAL ENGLISH LEVEL 3 | Voice-over | Ian Harker | Richmond Publishing | |
| 2009 | IN COMPANY UPPER INTERMEDIATE | Voice-over | Ian Harker | Macmillan Publishers | |
| 2008 | DBS COMMUNICATION SKILLS: MEETINGS | Voice-over | Ian Harker | Delta Publishing | |
| 2007 | ENGLISH FOR LIFE PRE-INTERMEDIATE | Voice-over | Ian Harker | Oxford University Press | |
| 2007 | CORNELSON SHORT COURSES FOR EXPRESS SERIES | Voice-over | Ian Harker | Oxford University Press | |
| 2005 | THE PERSIANS | Messenger | David Blount | Open University | |
| 2004 | READING HOMER | Narrator | David Blount | Open University |
Leighton trained at LAMDA where he played the following roles
| 2004 | LES MAINS SALES | Hoederer | Lydia Ziemke | ||
| 2004 | MAGGIE MAY | Willy Morgan | Steven Jameson | ||
| 2004 | COLLATERAL DAMAGE | Ted Kaxzynsky | Mike Alfreds | ||
| 2004 | STRANGE ORCHESTRA | George | John Link | ||
| 2004 | THE REVENGER’S TRAGEDY | The Duke | Rodney Cottier | ||
| 2003 | THE MAN OF MODE | Sir Fopling Flutter | Rodney Cottier | ||
| 2003 | THREE SISTERS | Solyony | Colin Cooke | ||
| 2003 | TRANSLATIONS | Jimmy Jack | Joseph Blatchley | ||
| 2003 | PROMETHEUS UNBOUND | Chorus | James Kerr |
Speaks fluent German, advanced Italian and basic French.
Good ear for accents, sings Baritone/Tenor.
Advanced stage combat skills.