Wonder if any of the resident Oyster gurus can assist me? I regularly
make the journey from Honor Oak Park to Watford Junction and have
until recently not paid much attention to the fare (using unregistered
PAYG, so no journey history). Lately I've become curious as to the
cheapest reasonable way of doing the journey. Reasonable meaning "so
that it doesn't take three hours". Used to take NR from Honor Oak to
London Bridge, then Northern to Euston and NR onwards to Watford. Am I
correct in assuming this is an expensive way of doing it? Recent
experiment has been Overground to Whitechapel, pink validator, H&C to
Euston Square and then Euston to Watford Jnct. NR, which off peak came
in at £2.50. I assume that's by virtue of the OSI between Euston Sq.
and mainline? Probably not the most taxing topic ever posted, but
everywhere else I look seems to give different answers, and I'd just
like to know the logic behind the various fares.

P.