Paul Corfield wrote

I would be surprised if the main line gates were set up for auto top
up
activation as they are not TfL gates - they are National Express
gates
and not linked to the Prestige central system (at least as far as I
am
aware).

Um Liverpool Street NR to Stratford, Seven Sisters, Tot Hale and
Walthamstow Central are available as Oyster PAYG so surely they have to
be ?

--
Mike D