"..the next pregnancy produced a Rh.negative baby, that is the baby that would be affected (maybe fatally) by the antibodies it could get from you."
Surely you mean Rh.positive.baby.
On another note, I have a friend who used to teach typing at the Sevenoaks blind school mentioned in the programme and my parents met the chap at the church in West Tarring when researching my mother's tree.
More importantly, I have been wondering whether there might be some information (in the form of a letter of dismissal or minutes, for example) in diocesan or other records at Chichester or elsewhere that could shed some light on Richard's exit from West Tarring.