Was there a few years ago. I hitchhiked up from Abergavenny & had a wonderful afternoon there.

Under-5 pneumonia and influenza deaths decline concurrently with diarrhoeal diseases, as observed in other countries. I suspect the spikes in the early 1970s are due to local waves of the H3N2 global (Hong Kong) flu pandemic.

The decline (while far from fully converging) is also mysterious, especially given the Group Areas Acts, worsening economic conditions, and political unrest. ORT might be part of it, but it became readily promoted only in the late 80s.

Two come to mind, I’ll pass it on :)

Source: Strebel P, Hussey G, Metcalf C, Smith D, Hanslo D, Simpson J. An outbreak of whooping cough in a highly vaccinated urban community. J Trop Pediatr. 1991 Mar;37(2):71-6. doi: 10.1093/tropej/37.2.71. PMID: 2027168.

Tom Hollander's is the best of the genre