8. Miranda Hart
The star of her own BBC sitcom Miranda and co-star of Call the Midwife was offered the key guest role of Madge Arwell in the 2011 Christmas special The Doctor, the Widow and the Wardrobe. Apparently, the production dates clashed with other projects and Outnumbered star Claire Skinner stepped in to fill the role. While Skinner was arguably more suited to the role of a grieving widow, Hart would probably have been better utilized than her fellow comedians Bill Bailey and Arabella Weir were in the episode. She did, however, get to chase the Doctor around in a promo for the BBCs 2012 Christmas programming lineup.