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or you're a strong climber used to riding round the Chilterns on fixed
5 years ago (actually Kent Hills) now, not so much.
I have thought about the Cyclotouriste option - current period correct intention is a nice original chrome pair of Gnutti cranks with a simplex adapter.
I’m not sure what the bcd is on this setup, I can go as low as 45 or maybe 44.
absurdbird
As I've mentioned above, the TdF mech struggles to get onto a 22 sprocket, although a 23 is said to be possible. I'd guess the JUY 51 is probably a bit better (no direct experience). I think it was a weakness with all those pull chain mechs which go into bottom with the cable slack
If you're mainly going to ride round London Airport, or you're a strong climber used to riding round the Chilterns on fixed, 46 x 22 would be fine, otherwise I'd be thinking about the possibility of a smaller inner ring, probably TA Cyclotourist.
It's one of the mysteries of 1950's bike racing - how did they manage to get up those climbs with bottom gears not much under 60".