I have almost the entire sereres here in Belfast on Region 2. Just a few more xmas specials and season 7 to complete the set. As for region 1 release, i think you may be in for a long wait. Check this link out for full epsiode and xmas sepcial list.
From what I understand, the US set has a "Christmas Trees" sketch from a UK television special ("Christmas Night With the Stars", perhaps) that was NOT included on any of the UK discs.
Sad, though (according to reviews), that in general, picture quality on the episodes in both R1 and R2 are nothing to write home about and 'artefact-filled.' My guess with the R1 is they tried to squeeze too much material onto not-enough discs.
I would think twice about importing any R2 "Only Fools" DVDs.
Poor picture quality aside (according to reviews), the BBC have announced recently that any all contemporary BBC comedy series (basically, anything they think has a chance of being repeated on telly) are going to be screened and when it comes time for repeats and UK DVD releases, the episodes will be purged of any dialogue considered potentially offensive.
It all started when someone complained how Del Boy used the term "Paki" (for Pakistani) in last year's Chrstmas special. The BBC then decided that the word would be cut from all future repeats and the DVD release.
So, any DVDs of the series you buy from this point forward are likely to be even more cut than they are now (most of them are currently cut (or new tracks substituted) due to music-rights reasons.
As in the case of "Blackadder's Christmas Carol" (edited in the UK, uncut in the US), perhaps Wordwide's American division will issue the uncensored versions in R1, regardless of what they do in R2.
It's in the scene where Baldrick is describing the Nativity play to Blackadder and telling him the crowd loved it and wanted another one at Easter. The cut is to the line "they want to see us nail up the dog."