Hi,
Received my LEXX boxed set today, and can confirm that the Season 1 movie-length episodes, are identical to previous US and UK DVD releases.

Ironically, this set is released by Echo Bridge Entertainment, who put out the newest Season 1 release in the USA. The difference is that the UK versions have extras on them!
All episodes have been re-certificated as 15's, including Seasons 2-4 inclusive, and no cuts appear to have been made to the Season 2 episode "Luvliner" which was originally given a BBFC 18 rating for the sexual material.
Any episodes originally rated 12 have been upgraded to a 15, purely because Echo Bridge Entertainment, (releasing the series in the UK as "Medium Rare Entertainment""), requested certificates to be undertaken on a disc-by-disc basis, and not episode-by-episode! This reduced the costs during the certification process!
There are 19 discs in total, broken down as follows:
Season 1 - 4 discs
Season 2 - 5 discs
Season 3 - 4 discs
Season 4 - 6 discs
The extras are excellent, and most are 15 minutes or more in length, meaning you get a good amount on this set, and are spread out across all 4 seasons.

Episodes are visually impressive, with a DD 2.0 Stereo soundtrack, and all are in their original 4:3 aspect ratio. There are no English subtitles of any kind, except those burned-in to the original episodes, where applicable, that translated alien languages into English.
Each Season is in a standard Amaray DVD case, all housed in a thin but reasonably cool cardboard outer case-sleeve.
All-in-all, a set I can heartily recommend.
Pooch