Nigel Havers plays his grandfather Lord Havers, the high court Judge in this case.
Ruth Ellis shot David Blakely on 10 April 1955, firing six shots. The sixth bullet ricocheted off the ground and injured bystander Gladys Yule. Gladys Yule also testified in court. These two important details did not appear in the film.
The "Racing car meeting" scene was shot in Ivinghoe Beacon car park, Buckinghamshire. The outdoor pub scene was shot in the nearby village of Aldbury.