An amazing coffee location, much preferred to the typical cafe's in the area. My tip is make sure you get to the station early so that you can take time out here for a coffee.
There are two Starbucks here (and the hut outside) - one in the row of shops parallel to platform 1, the other one near the near Bishopsgate way out. The latter is nicer!
The Starbucks on the way out of station (next to Pret) is CRAP! Never had a good coffee from here, mostly cold but last time my cup was only half full! £3 for a cup of froth! FAIL!