In ,
TKD typed:

But using
Thameslink with prepay and being charged correctly (and let out of
the barriers of London Bridge!) is still beyond me.

Presuming that you have 'touched in' at an appropraite Thameslink
station, when you arrive at London Bridge 'touch out' on the platform.
'Touching out' again on the pad on the exit gates will then allow you to
exit.

Works for me (nearly) every time.
;-)


--
Bob