Bunkermagnet
Journeyman Pro
But you dont use a stopwatch, how are you so sure it was "exactly"30 minutes? Should we just assume approx 20?30 minutes on the phone to TFL to sort out a total of £9.10 in fare refunds. (Most of that was 'press 4, press star' etc and being on hold for ages to be fair, the feller I finally got through to was very helpful!)