Cass ... Dougray Scott Kate ... Emilia Fox Dylan ... Jimi Mistry Vicky ... Billie Piper Adam ... Shawn Parkes Fiona ... Donna Alexander Joe ... Scott Chisholm Danny ... Charlie Cox Don ... George Innes Montgomery ... George Irving Colin ... Bruce Mackinnon Sheera ... Keira Jane Malik Billy ... Roger Morlidge Johnny ... Danny Nussbaum Gavin ... Chris Polick Captain ... Adam Redmayne Toby ... David Paul West Claire ... Nina Young