I love Cohen's playing - if you haven't seen his university recital then check this out (from 5'40 ish) - 40mins of classical music transcribed for the melodeon and concertina(!) https://livestream.com/uol/final-recitals-17/videos/157705262?t=1511480906236

Alex Wade is a brilliant young English player too - https://www.youtube.com/watch?v=i2weghwmeXY

At the other end of the scale age-wise, I'm a big fan of Iris Bishop's Maccann duet song accompaniment, particularly on this recording with Shirley Collins from about ten years ago - https://youtu.be/Qeb4xSMVj-A

As a player I'm most interested in accompanying singing so Iris' playing and Rob Harbron's beautiful sense of chords are my two biggest influences.