Eastenders: Carol's big reveal?

Somebody else spotted this and watching it again, the outside scenes were not Patsy. You never see her face. I think reshooting had to take place as Patsy had her baby prematurely. Apparently the scenes were Max speaks to Carol were meant to be Bianca's and bringing in Lauren and Vanessa in that episode was a last minute change. It's a bit weird Bianca would just hit Connor as she didn't know that he was also seeing Whitney. That would have been more motivation.