Thanks for the responses. I'm researching a pedigree that was created in the late 1880s (by the Lancaster Herald), and that has a number of errors. Some of the sources are inaccurate; some of the sources, if they ever existed, no longer seem to. A year ago I contacted the College of Arms, hoping for answers to some of my questions. I received a very pleasant and friendly response from the officer, who asked me for specific questions, and he'd see if he could find the answers for me. I sent him the relevant questions; he said he'd look into them, and I've never heard back.
Bridget