I’ve been trying to work out how to interchange from Thameslink (pl 7) to Great Northern (pl 1) at Finsbury Park, bearing in mind the gateline at platforms 7-8, the validators at platforms 1-2, and the lack of an NR-NR OSI. I was looking to do Blackfriars – Finsbury Park – Drayton Park.
In the reverse direction, it’s easy as the gatelines are continuation entry, and the validators could be ignored. But I’m not sure that there’s a way to do it in the opposite direction. When I arrived this morning I gave up and walked instead!