I would think Lee Howard on here would know a fair amount about them, and he is co author of ‘Fleet Air Arm Fixed Wing Aircraft since 1946’ which I would think is the best published source on individual and overall histories.

I remember them operating at Culdrose up to late ’80s (771 sqn possibly?), and saw XK895 19-CU at Kemble about three years ago.
I could never quite understand why the Navy replaced communications Sea Prince C.1/2, with similar vintage Sea Devon C.20 & Sea Heron C.20s?

Sea Devon C.20 XK895 19 CU Kemble 11 Aug 09 by jamtey71, on Flickr

Sea Devon C.20 XK895 19 CU Kemble 11 Aug 09 by jamtey71, on Flickr