There were maybe three or four hundred people in the square, mostly huddled on the steps. My companions and I chose a vantage point on the edge of the left-hand fountain, which meant that when the rain got heavy I could put my umbrella up without worrying about spoiling anyone else's view.
'High Treason' is a fable in which the Peace League tries to prevent wicked, cigar-smoking profiteers from engineering a war between the European Federation and the Atlantic States. Astoundingly, it predicts the Channel Tunnel, tiltrotor aircraft and the carrying of small dogs around in bags - though, alas, we still lack tables that fold down from the wall ready-set and hot air driers for use after gratuitous shower scenes.
This evening from 6:30 there's more: London Loves, a selection of rarely-glimpsed short films showing life in the capital from before the First World War to the 1950s. Before last night's movie started, screencaps told us what a sampling of Londoners loved about the city: Carnaby Street, Chinatown, taxis and so on.
For me, sitting in Trafalgar Square in the rain watching a free film with my mates pretty much covers why I love London.