Stand outside Alexandra Palace on a clear evening with a full moon, as I did last night, and you can take in the whole city. London may be as silent as it gets from this vantage point, but the landscape is loud in its own way. The glittering towers that dominate the skyline were all built in the last 50, probably 20 years. The red lights dotted in among them are all cranes, standing by to change the shape of the city once again. Scan the horizon, and you’ll be reassured perhaps to see the dome of St Paul’s – a symbol of continuity, a connection between modern times and the age of Christopher Wren, going back to 1710.

Swivel on your heel, and pivot to 1873 or thereabouts, when Ally Pally itself, the “People’s Palace” first opened. I had a date to keep at the theatre, recently restored to what the owners call a state of “arrested decay” and reopened to the public. We were there to travel back to a fuzzy combination of the 1880s and the 1920s, to revel in the BFI London Film Festival’s latest archive presentation: Silent Sherlock.