Siobhan Finneran (Clare Cartwright) & Kevin Doyle (John Wadsworth) also worked together on Downton Abbey (2010) as Sarah O'Brien & Joseph Molesley respectively.
Shirley Henderson (Frances Drummond) & Matthew Lewis (Sean Balmforth) also worked together on the Harry Potter films as Moaning Myrtle & Neville Longbottom respectively.