Tandemrotor. I found this article on the airliners.net forum. It was published by (I pressume) a BA insider (credible source this guy/girl) on the 10th. So I guess that the period ends late NOV.
Yes, the fleet renewal poses a problem for BA in the current economical climate. But in my opinion not spending the money on a new fleet poses a bigger threat to BA (CF's) position and future @ LCY. Things will pick up again and we've gotta be ready.
Hope they are gonna be smart and go for the Embraer. Let's wait and see shall we.