Quick question - I know there've been a variety of these threads covering what to do if you are close to passport expiration. (For example, it's widely known that South Africa won't admit you if you're within 6 months of passport expiration when at the border.)

I'm in a situation where a trip is scheduled to the United Kingdom from the US; the passport remains valid for the entire duration of the trip, but it will be within a month of expiration (the trip is in early February, and passport expiration is early March.)

Does the United Kingdom require a certain amount of spare passport validity for visitors, or is everything fine as long as the passport remains valid for the whole trip? (I've contacted the embassy, but they're probably out for the Christmas holidays, so if I need to start a renewal with the state department, I'd like to get the ball rolling ASAP.) Will the airline and US CBP also be OK with it?

Also, for others looking for this sort of thing in the future - is there any authoritative source that lists the rules around passport expiration for all countries? I tried searching both flyertalk and the web in general, but came up empty handed...

Thanks,
Ben