Other travel during the day had almost applied an off-peak cap to my card so I took the opportunity to investigate reports of problems, both current and future, at Finsbury Park. Before I outline the full story though, the important message here is that at the moment you do NOT need to touch out or in if interchanging between Underground and National Rail. In fact, if you try to touch out you will hit serious problems.
As usual I started my journey at Crayford.