That's beautiful! makes me proud to be a Londoner!

I believe it's the Canary Wharf area featured in the clip.

yes, it is. Like the rest of London it looks much better on film than in reality.

I like the effect of the lights that come on when you enter a room then go off after a few minutes - presumably the caretakers working overnight - the building looks like it's playing Snake with itself

haggis: exactly right. I lived in downtown Portland, OR for several years. You could watch the cleaning staff in every building go about their job most every night. They'd always start at the top and go down... never found out why though.

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The duration of this video has been updated from unknown to 44 secs - length declared by bareboards2.