Originally Posted by
craz
T4 has the stations in its basement , while T1-2-3 has only a centralized station that is a much longer walk.
The HEX was the way to go between T1-2-3 & T4 w/o having to pay, so I will Assume you can still use the HEX for free within LHR and therefore would simply jump on it to T4 if in fact it passes T4 from T5
It actually doesn't. HEX has a station at T1-2-3 with a shuttle to T4 and a station at T5.