Guest Stars Anton Lesser as Austin Carmichael Roger Allam as Group Captain Alastair Graeme Anthony Calf as Wing Commander Martin Keller Geoffrey Hutchings as Harold Smith Hugh Lloyd as Frank Watson Naomi Frederick as Anne Roberts Jamie Parker as Bruce Leighton-Morris Adam Kotz as Henderson Eileen Davies as Enid Smith Stephen Moore as Iain Stewart Jane Booker as Elizabeth Graeme Bill Thomas as Willis Tom Bowles as Graham Davies Louise Breckon-Richards as Jane Holdsworth Ifan Huw Dafydd as Creavey