With current schedules the way they are, it looks likely that the BBC will overtake Sci Fi's US airings of new episodes of season four from the 12th episode, "Kansas". The BBC have previosuly premiered the final four episodes of both seasons two and three before they aired on Sci Fi in the US. With new episodes set to return to Sci Fi on
January 10th at 8pm (resuming with "Kansas"), the BBC are set to get at least one episode ahead by that time.
Following tonight's airing of "Coup by Clam", current BBC schedules have a break next week for snooker, but Farscape returning in two weeks, on
Monday, 16th December at
6.45pm for David Kemper's "Unrealized Realities". At this time, there is also an episode scheduled for broadcast on
Monday, 23rd December at
6.45pm, and assuming the schedules don't change (which they're unlikely to), this would be the world premiere of "Kansas", penned by Justin Monjo.
Following that episode, there will be a break for Christmas, but it's likely the show would return on Monday, 6th January, to broadcast Richard Manning's "Terra Firma", which would put the BBC two episodes ahead of the Sci Fi airings, although it's highly likely there will at least one more break in the episode run in the new year. Whatever the case, at this point, unless the BBC opt for some squeezing in of episodes as they did
last year, it's highly likely that the airing of the season four finale will be almost concurrent in both the US and UK.
Please note that, as always, schedules are current as of now but are
subject to change at any time. During this time of year in particular, last minute schedule changes are quite possible.