he/him 
First impressions of London: - it actually rains - the tube isn’t that bad, at least not during rush hour - word choices are slightly different, e.g. “way out” instead of “exit” - some parts of the city bring me nostalgia of the pre-1997 HK, e.g. pedestrian crossing button
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There’s no ventilation?!?
There is. There's dedicated ventilation buildings that blow air into the tube. The tube was originally pretty cool when it was first built, but over the years the heat from the trains ended up solidifying the clay around the tunnels which allowed even less heat to escape.
