Henry's ex wife sue is played by Sheila Hancock, John Thaw's real wife from 1973 until his death in 2002.
This is the first of only three times that John Thaw and his wife Sheila Hancock appeared together in TV dramas. The other two were S6, E3, The Death of the Self (1992) of Inspector Morse (1987) and S3 E2, Blood Money (1997) of Kavanagh QC (1995).
One of just two episodes to chart in the Top Ten, along with Suspect (1985). 10.31 million tuned in, causing it to rank in 9th place.