The star of Downton Abbey, Twenty Twelve and Rev talks to IdeasMag about the differences between stage and screen, dealing with auditions and how National Youth Theatre changed his life...
For more video interviews, tips and advice, check out our video exclusives.
The new series of Twenty Twelve will be shown on BBC2 from Tuesday 10 July at 10pm.
Sign up to IdeasTap for advice, funding, opportunities and our weekly newsletter – with all the latest arts jobs.