I haven't got by head around if and how Taxiway Foxtrot would help trapped aircraft on the Eastern Apron. If the tug took the aircraft to the south of the intersection it then can't get back as the towed aircraft is now in the way. If it took the aircraft to the north of the intersection as happens now what has been gained? I am assuming Taxiway Foxtrot will allow arriving and departing aircraft to pass each other rather than waiting at Alpha.
Out of date now but this is the NAT's view of Luton
Control tower view