Ioan Gruffudd character William Wilberforce
Romola Garai character Barbara Spooner
Benedict Cumberbatch character William Pitt
Albert Finney character John Newton
Michael Gambon character Lord Charles Fox
Rufus Sewell character Thomas Clarkson
Youssou N'Dour character Olaudah Equiano
Ciarán Hinds character Lord Tarleton
Toby Jones character Duke of Clarence
Nicholas Farrell character Henry Thornton
Sylvestra Le Touzel character Marianne Thornton
Jeremy Swift character Richard the Butler
Stephen Campbell Moore character James Stephen
Bill Paterson character Lord Dundas
Nicholas Day character Sir William Dolben
Georgie Glen character Hannah More
Nicholas Woodeson character Harrison
Tom Fisher character John Ramsay
Richard Ridings character Speaker of the House
David Hunt character Lord Camden
David Toole character Beggar
Alex Blake character Heckler
Angie Wallis character Marjorie
Harry Audley character Edward Hope - Quaker
Chris Barnes character Michael Shaw - Quaker
Tom Knight character Physician
Andrew Whipp character MP 1
Andrew Neil character MP 2
Estelle Morgan character Maid
Philip Dunbar character Camber
Adam Woodroffe character Parliamentary Clerk
Joseph Traynor character Newton's Secretary
Simon Delaney character Young Parliamentary Officer
Neville Phillips character Old Parliamentary Official
Eki Maria character Young African Woman
Daniel Naprous character Delivery Coach Driver
Peter White character Delivery Assistant
Hugh Allison character Pitt's Caddy (uncredited)
Richard Bailey character Clerk (uncredited)
Nigel Martin Davey character Boat Servant (uncredited)
Derek Hagen character Parliamentary Messenger (uncredited)
Peter Halpin character Clerk (uncredited)
Alexander Hathaway character Member of Parliament (uncredited)
Lindy Hennessy character MP's Wife (uncredited)
Michael Hennessy character Member of Parliament (uncredited)
Joe Lloyd character Member of Parliament (uncredited)
Miguel Pinheiro character Minister of Parliament (uncredited)
Alwyn Scott character Parliamentary Clerk (uncredited)
Aaron Sweeney character Member of Parliament (uncredited)
Nick Thomas-Webster character Member of Parliament (uncredited)
Tom Toolan character Member of Parliament (uncredited)
Chris Wilson character Member of Parliament (uncredited)
