He has appeared as the insufferable Mr Elton in the 2009 version of Emma
and also as the caring Edmund Bertram in the 2007 Mansfield Park - very different characters indeed!
Jonny Lee Miller:
He has appeared as the dashing Mr Knightley in the 2009 adaptation of Emma,
the thoughtful Edmund Bertram in the 1999 version of Mansfield Park
and he was also in the 1983 version of Mansfield Park as little Charles Price, but I couldn't find a photo of him as this small part!
Sylvestra Le Touzel:
She played the timid Fanny Price in the 1983 version of Mansfield Park
and also she appeared as the silly Mrs Allen in the 2007 adaptation of Northanger Abbey.
He played the kind Edmund Bertram in the 1983 version of Mansfield Park
and also appeared as Mr Musgrove in the 2007 version of Persuasion.
She was the lovely Mrs Weston in the 1996 (Beckinsale) adaptation of Emma
as well as the foolish Maria Bertram in the 1983 version of Mansfield Park.
She played the annoying Mary Musgrove in the 1995 version of Persuasion
and the, once again, annoying, Miss Bates in the 1996 (Paltrow) version of Emma, similar characters in some ways!
And finally, Carey Mulligan:
She played the innocent Kitty Bennet in the 2005 adaptation of Pride and Prejudice
and the deceiving Isabella Thorpe in the 2007 version of Northanger Abbey - I like her as innocent Kitty!
There could well be more but these are the ones I have noticed, and I thought I would share them :)
Your affectionate friend,