I would suggest not being in a huge rush - the area generally used by JQ was originally set up to service a few TurboProps; now JQ are using it, it is not a very nice area with limited seating, little space and a generally poor atmosphere. ("Cattle Yard" comes to mind.)
Couldn't agree more!
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T4 entrance is effectively moving about 100 metres north (IIRC will be connected airside with T3).
No more than a 10 minute walk from the QP.