Just a thought - but (and I think I may know the answer to this...) - is there a "back out" plan for T5?
I've project managed a few large projects in my time (although none as big and as complex as the T5 move) and the golden rule was "always have a back out" - ie, if it all goes tango uniform, get back to something that you knew worked.
Could BA go back to T1 and has anyone planned for it??
TA (with an MBA, without chip on shoulder)....