If (1) you work at Imperial College London, and (2) you are working medium-late nights, and (3) it is between July and September: do not try to set off home any time between about 10pm and 10.45pm, because the Proms will be kicking out.

This announcement brought to you by having, today, managed to leave at 9.15pm, thereby managing to get on the first relevant bus to go by -- and even it had empty seats instead of being standing room only.

(My arrival home was Somewhat Delayed by Stopping Off At King's Cross To Pick Up A Burrito, and indeed I'm writing this from the Piccadilly line, but I am willing to say - very cautiously, in case I jinx it - that I have had a tentatively good day, and might even get to sleep before midnight.)