There were a couple of tough questions — mostly around “why bother with an ID card at all” — but on the whole the people there were very nice to me, and prepared to listen to what I suppose must seem like a fairly radical idea if you are from a conventional security background.
As the comments on the original blog post seem to indicate, I think I’ve stumbled on a useful way of describing an alternative form of identity card. I’ve been writing it up in more detail for a journal, so hopefully I can address some of those issues as I go along with the “psychic rewrite”, by which I mean that I’d already prepared a paper on how to use smart cards, mobile phones and so on to create new kind of identity card, but I’m currently rewriting it to use the Dr. Who framing as it does seem to speak to people far more effectively than any of my previous attempts.