I agree with the above posters. If you didn't get the immediate upgrade at purchase, lately it seems it then doesn't happen until about 1 week or so before your flight. The only problem I see is that your flight falls within CO's holiday BF sales period, so many of those BF seats might have been purchased at the sale $1200 r/t rate and seats hadn't been chosen as of yet. If riding up front isn't that important, cancel yourselves off the waitlist and pay the $40 for both of you to travel in F on the Gatwick Express to ensure access to Fast Track.