More or Less with Tim Harford started again this morning 9-10am. It is a worthwhile listen because it is informative and debunks some stats used in political debates.
The Pfizer vaccine was discussed this morning and concensus similar to your post Allegrias. No evidence that first vacc won’t protect adequately, just not time for enough data yet. On past experience, protection will likely last long enough until 2nd later than projected dose.
To think that London, or anywhere else for that matter, does not belong to any one demographic