Red Shift is a 1978 BBC Play for Today episode based on a novel by Alan Garner. The series also produced but never aired Brimstone and Treacle because of controversy over its content. The series was cancelled in 1984. It's said to be remembered for its high quality and the conservatives' suspicion of its political agenda.
This episode is about three men from different historical periods (a 1970s young man in love and struggling against his parents, a Roman soldier of the lost Ninth Legion, and a young married man defending his town and church during the English Civil War) who are somehow connected at points of extreme stress in their lives.