The bulk of this material comes from Liaison Office files classified as part of the Chief Secretary's division at C0524 (with numerous sub-references). The proceedings of the conference were, in part, filed there but were mainly treated as books to be shelved or briefing material to be set apart. For some conferences, more than one set of proceedings (of varying completeness) survived - perhaps a personal copy alongside a Liaison Office/Unofficial Members' Association one - and, in the…