The Comedians' Guide To London loves a bit of London geekery, and musical comedian Jay Foreman clearly has loads of it. He has put together an evidently meticulously researched video about the northern line – more specifically, an odd little branch at the top of it that connects Finchley to Mill Hill East. It's called Unfinished London, and in it you sift through the murky waters of disused tunnels, town planning and Hitler.

So if you love a bit of local London knowledge, complete with historical context, this one's for you. Cheers Jay!