wrote

Southeastern seem to have taken matters into their own hands in quite
a forceful way:

http://www.southeasternrailway.co.uk..._items/view/95

Southeastern has agreed to accept valid tickets for the Underground -
both paper tickets and Oyster Pay As You Go - on services that mirror
Tube routes on our network.

So during the strike we will accept London Underground passes
(including Oyster PAYG) during the strike on the following routes
only:

Brixton to Victoria
Elephant and Castle to Blackfriars / City Thameslink
London Cannon Street / Waterloo East / Charing Cross

------
Unless either TfL, or SWT and Southeastern, change their advice (and in the
case of TfL, publicise any changes very clearly) I can foresee big
arguments.
What about a passenger whose normal route, using PAYG because he only
travels two or three days a week, so a season ticket is uneconomic, is bus
to North Greenwich then Jubilee Line to Bond Street. A sensible alternative
route would be Southeastern from Charlton to Victoria, changing at
Blackheath, then bus or walk. IMHO that route mirrors the passenger's normal
tube route, and even on their restricted view, Southeastern should allow it.

Peter.