The much maligned 'gripper' actually had a better field performance than the 1.11.
I flew them both and saw the far end of more runways in a 1.11 than I care to remember.
Aberdeen - LHR on a warm day with a full load, 1.11's used to have to tech stop EDI for fuel, because it couldn't lift the weight out of ABZ
The poor runway performance of the 1.11 was a contributary factor in the very near accident at Basle in the 80's
Backup flights often used to take off after the 1st service, and arrive before them, because BA used the Trident 3, or latterly the 757 for the main flight, and Trident 1's & 2's for the backup.
T1's & 2's had faster speed limits, and would generally be lighter than the fully loaded Frontline T3. It was quite easy to outpace them on the way and land first, always to the chagrin of your colleagues of course...........