Peter Masson wrote:

"It's been 4tph Mondays to Fridays for quite a time, and IIRC it's
never been
less than 3tph. Saturdays has recently iuncreased from 3tph to 4tph,
and
Sundays from 2tph to 4tph, presumably as part of TfL's 'Overground
Network'
scheme. Are TfL subsidising the increased weekend frequency?"

Before the December timetable change there were only 2tph in the
evenings Monday to Friday. Saturday evenings were also 2tph. Sunday
evenings are still only 2tph.

Barry Buitekant