So, this evening I went to a talk at Hampshire Record Office about using their archives for researching family history. Since they obviously specialise in Hampshire, there's only a limited amount that's useful to me (see above re: Cornwall), but I thought it would be useful to see just how Records Offices in general work.
And I did get to grip with catalogs and microfiche viewers, and also in the introductory talk had a sudden burst of inspiration. The talker mentioned tithe maps and the rolls that go with them, and that may help me with tracking down the Warrens who have a bit of a gap in their timeline, since they don't seem to be appearing on the online censuses. It could be that they haven't been transcribed yet, and when I get a chance to look at the microfiche versions I'll be able to find them, but if not, I think a tithe map might show them since they were farmers.