There is a village in Sussex with a large lay by close to a bus stop. I have seen people (from surrounding areas ?) park there and catch the bus to the nearest town. Sort of an unofficial park and ride.
Unless there has been a change recently there is a two tier system in London. The over 60 scheme is confined to free travel only in the TFL area and there is a second tier which matches the National Scheme allowing use throughout England.
I believe Brighton & Hove free passes allow travel after...