@russss @tess_machling I've had at least 4.Two at school, I think, one at uni when people started getting mumps and one when we moved to the US for a while and they wouldn't accept my vaccine records so I got another top-up.Always good to ask.

@tess_machling as a schoolboy I was told that you could find Roman pottery along the hedge lines in paddocks around my school in Northamptonshire. I never went, but it now seems obvious that there was much to gain by intelligent field-walking. I guess I just was not intelligent enough.