The question must be asked as to why they are releasing 50 year old movies with regional locking.
I suppose that's part of the licensing deal, but I have no idea how it works. Twilight Time release MGM (UA) films multi-region, but when Kino release MGM, they're region A locked. The UK & German 55 Days are locked to B, but the French release is multi-region. I suppose Americans can import the French one, it'll cost a wee bit more, but it's got a very nice cover. It was restored from the original negatives at Pinewood, & I'm hoping they're working on another one, maybe The Fall Of The Roman Empire.