Jock_Girl, you could probably even put it as a Canadian release as well as a US release. My understanding is that these UK pressings were as much for Canada as they were for the USA. I'm not really comfortable with the idea of making these UK export issues, as we know that the intended markets were US and/or Canada, but I agree that a generic North America country credit would be useful. (Maybe even just "Americas" - I know that UK Decca had to use the London name in South America as well, but I haven't yet heard of any UK pressings being exported there, though it would have to be a possibility that the ships would continue south after discharging loads in Montreal and New York).
I just remembered that I came across a Louis Armstrong discography a few months ago, so here are the session details:
"Louis Armstrong With Gordon Jenkins' Orchestra
November 28, 1951, Los Angeles, CA
It's All In The Game (Sigman, Carl; Dawes, General Charles G.) [master L6550] -- Decca 27899
When It's Sleepy Time Down South (Rene, Leon; Rene, Otis; Muse, Clarence) [master L6551] -- Decca 27899
When It's Sleepy Time Down South (Rene, Leon; Rene, Otis; Muse, Clarence) [master L6551] -- Decca 27899
Jeannine (Shilkret; Gilbert) [master L6552] -- Decca 28076
Indian Love Call (Friml; Harbach; Hammerstein) [master L6553] -- Decca 28076
Armstrong, Louis (Trumpet, Vocal)
Jenkins, Gordon (Arranger, Conductor)
Grifford, Charles (Trumpet)
Thow, George (Trumpet)
Hudso, Bruce Hudson (Trumpet)
Miller, Eddie (Tenor Saxophone)
Eckel, Dent Eckels (Tenor Saxophone)
LaVere, Charlie (Piano)
Reuss, Allan (Guitar)
Stephens, Phil (Bass)
Fatool, Nick (Drums)
Unknown personnel (Strings)
The two takes of SLEEPY TIME are identical, except that the second (used on all reissues) substitutes the word "people" for "darkies". "
You can't necessarily go by the matrix numbers when determining the A-side - in US Decca's case (where these comes from), the matrices simply reflect the order in which the songs were recorded at the original recording session, which looks to have been in Los Angeles. Anyway, "When It's Sleepy Time Down South" was the charted side in the USA, entering the chart on Jan 17th 1952 and peaking at #19 (Decca 27899). Louis first recorded the song in 1931 (Okeh 41504). I don't have a UK release date, unfortunately, because Paul Pelletier's Brunswick listing started at 05000 (November 1952). It's always possible that UK Decca/Brunswick changed the A-side for UK release, but who knows at this late date?