In a message dated 2/23/2005 10:33:50 AM Mountain Standard Time, shimmin@uiuc.edu writes:
In the US, a work first published in 1970 has a 95-year term, and won't
hit the public domain until 2066.

In the UK, posthumous works are no different than other works today, but
that has only been the case since 1988.  Before 1988, posthumous works
got a 50-year copyright (2021).  This may have been extended to 70 years
since then (2041).
So who is going to complain? There is a new edition as of about 24 years ago, which includes all Pepys's XXX comments that are omitted from the earlier edition.
 
Anne