On 19 Nov, 16:37, wrote:
I did wonder whether I could touch-in at the Liverpool St gatelines,
and then just leave the journey unresolved as it was the last journey
I intended to make that day.

You get charged £4 when you touch in, even if you've already reached
your cap. This gets reverted to zero when you touch out. The
intermediate validator trick works because it refunds the £4 without
marking you as having touched out.

The way to do it on your journey would be to take the Central Line to
Stratford, touch one of the validators on the platform and take the
direct Stratford-Stansted service to Harlow. You will be defrauding
NXEA of the Stratford-Tottenham fare, of course.

U