Radio Times have confirmed that Imelda Staunton will be lending her vocal talents to the role of 'Voice of Interface' in 6.10: The Girl Who Waited.

BAFTA award-winning actress, Imelda, will be best known to cult fans for her role in the Harry Potter movies as Professor Dolores Umbridge.

In other casting news, the synopsis for the Series 6: Part 2 DVD confirms that Simon Callow (Charles Dickens in the Series One episode The Unquiet Dead), will be in the final episode of the season 6.13: The Wedding of River Song. The synopsis also confirms rumours that Mark Gatiss (New Series Writer & Professor Richard Lazarus in 3.6: The Lazarus Experiment), will also appear in the finale.

It is unknown at this point, which character he will be playing, but we cannot rule out a return to the role as Charles Dickens.

[Sources: Radio Times; 2|Entertain]