Came back from JFK in the back of probably one of the last BA longhauls into LHR. Capt told us reason for having to wait for an hour for a remote T4 stand was because they couldn't use all of T4 stands if they thought they might need R23. Presumably they thought that the wind was going to back and give an unacceptable Xwind for 27. Don't know if thats true but thats what we were told.
As for bags, still waiting for ours.