Dropped in on the Royal Signals Museum (Sparker, take note). It displayed communications equipment from the Boer War onwards and was made all the more special by an oh-so-British guide (distinguished looking, grey hair, check shirt, cravat) who was a wealth of information about all the exhibits.
As it happened, the museum was inside an army base. I knew things would be interesting when the car park outside the base prohibited you from leaving cars unattended. Some park.
Had to check in, show ID and such like. I was asked the postcode of where I was staying (no idea) and comment was made of my accent - "Very gentle for an Australian...", (not a good time to try out my faux-Afghani accent) but they eventually photographed me and let us in. Margaret, pure and innocent that she is, got in unquestioned.