Other commentators have observed how accurately the minute details of the time, just after WWII, have been documented. I spotted several anachronisms and inaccuracies without looking for them. For example Auntie Vi watched an advert for Maidenform Bras on a television which had been bought in order to watch the Coronation; this would be impossible because (a) The BBC has never shown adverts. (b) A television bought in 1953 had no tuner and would be incapable of receiving the ITV signal. The chronology is a bit unclear at times too, for example when was Martin conceived?
Otherwise the story just about makes sense with some interesting pre-echoes of the Grantchester Mysteries. I didn't find it unputdownable but it made an agreeable bedtime read.