Sorry to keep asking random questions, but:

We (4 of us) are traveling on BA 214 tonight (BOS-LHR) and as I found out in my earlier thread, it is a packed house (completely 0'd in Y, very few seats in J/F). There is a VS flight that our friends are traveling on that leaves around the same time (even closer now with a delay) which is showing availability. So my question is, will BA will bump us to VS if take denied boarding? I have to imagine it's cheaper for them rather than deny boarding and give someone a hotel room for the night. If so, where should we ask? Should I call the Exec. Club #? Or wait until we get to the airport?

Thanks a lot!