Many thanks for all your thoughts 
I can see the benefits of recording - many a time one is sat in a meeting with a student making no notes whatsoever - but I would not like to see it overtake note-taking, as this is a skill (to be able to distil down key points) so I would see any recording as supplementary to that and not a replacement.
I like the idea of recording ones own lectures and posting them up - this was discussed a couple of years ago at departmental level and staff were against it as a rule, but there is no reason why one staff member could not do it. We do have a policy on lecture recording now, which places limits on the uses of materials, which was not in existence beforehand. This does not extend to one-to-one meetings.
In terms of LRD's example, we have a list of students with support needs circulated at the start of the semester, so I have to plan my lecture around the needs I know - including the need to record if that was stipulated. If I were to say that I would not record it, then I would anticipate planning a suitable alternative in advance. I personally think that there are so many ethical and pastoral issues around a lecture on sexual violence which includes personal testimonies from previous students (and/or participation by current students) that I would not do it without the appropriate consents for that material to be anonymised and shared in public. The Disability person, whilst rude, hints at a point you can't control - that people record the lecture anyway and don't let you know.
In some ways, I think this example does get at my concerns - a lecture is planned in advance, so you know the parameters it will cover. If you do a qualitative interview, you get appropriate consents and you have considered the ethical implications of creating and using the material and sought consent. An ad-hoc request to record a meeting is problematic as the implications have not been thought through - there may be no implications, but I think it still behoves on us professionally to give them consideration. And I agree totally that recording a seminar is inappropriate, unless all participants consent and get a copy of the recording. Seminars should be about speaking freely.