I remember reading a book on air accidents borrowed from public library during my teens. Memory/googling suggest it was 'Aircrash Detective' by Stephen Barlay. Written in mid/late sixties and covered post war accidents including the Comet going on to deep stall issues with early t-tails and the approach and landing accidents/incidents with 727 immediately after introduction to service.
Fairly sure it included a section on three pointer altimeters and the risk of 10k misreads, probably quoting this accident.
EDIT: The Wiki page on the IB Caravelle crash also refers to an accident in the US involving a United 727 which crashed into Lake Michigan in 1965. That too was attributed to mistake with 3pointer altimeters. It in turn links to a page on the Britannia accdient mentioned in the OP.
United Airlines Flight 389 - Wikipedia, the free encyclopedia
1958 Bristol Britannia 312 crash - Wikipedia, the free encyclopedia
The UA page also adds more data on tests carried out to explore reasons for altimeter misreads.