I suspected that B Part 2 might turn out fairly huge. However, like David, I'm surprised there are so few trios written by composers from Bo... onwards. And my wish-list of unrecorded trios is actually smaller than David's!
However one work not included which certainly deserves a place is Alan Bush's Three Concert Studies for Piano Trio, Op. 31 (1947). It is around 15+ minutes in duration, and each of the three movements seems to act as a test for some particular aspect of piano trio composition and performance. However that might make it seem a dry and academic thing. On the contrary, to hear it in performance is quite an exciting knockout experience!
There are two recordings: one, given by the Music Group of London, is on Lyrita SRCD256. This was reviewed on Music Web by both Rob Barnett and Michael Cookson, and both seem to share my enthusiasm for the work.
The other recording - which I haven't heard - is by the Barbican Piano Trio on ASV.
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