Many thanks Pitlamp, that's further useful information.
Ray Mansfield was, at one time, a member of Shepton so maybe that's the source of the Shepton Library List note from Ouan. I'll also be able to check out your reference to the CDG Newsletter 47, which we do have in the Library - although you do say that it doesn't include the "Letters to Members" at least I can see what it does say.
I don't recall seeing any of Graham Balcombe's material in any of our unsorted boxes. Although they are not "catalogued", i.e. the contents listed fully, they were checked roughly and a brief note of the contents made when we first acquired them from Roy Paulson in 2007. Sorting these boxes properly is on our rather lengthy "to do list" and, now we have a 3rd. person working in the Library, we are gradually beginning to make progess with the enormous backlog BCL inherited. (But it's a never-ending task because new stuff keeps arriving all the time.)