In message , at 18:40:42 on Thu,
28 Apr 2016, Graham Murray remarked:
Probably not double (have you seen how few people use the T4 station?), but
more certainly.

Latest annual station usage stats:

T123 7.49m
T5 3.90m
T4 2.35m

T123 serves 3 terminals,

There's only two at the moment.

so assuming it represents equal numbers of passengers using each
terminal, there is not much difference between 2.49m passengers using
the station for access to each of terminals 1, 2 and 3 and the 2.35m
who use the T4 station.

Not sure what your point is - other than perhaps all the terminals get
quite a lot of passengers.
--
Roland Perry