E. J. Moeran's violin concerto. Just listened to the Campoli and Albert Sammons recordings back-to-back - 1946/1954, both BBCSO, both Adrian Boult - they sound like two entirely different works by two different composers! And both excellent, although I prefer Campoli's fire to Sammons' noble restraint.
The first classical concert I ever attended was given by Campoli, with Daphne Ibbot. I love his recordings, an elegant and completely unforced style which I fear wouldn't make much impression today. Today is wrong.