Usage obviously varies from person to person. In my view it’s not enough for a bay to be a terminating platform in a through station - it also has to be adjacent to a through platform. So I would not regard the low level terminating platforms at Portsmouth and Southsea as bays - you have to walk from the platform ends and climb a staircase to reach the through (high-level) platforms.
Woking has a classic bay set into the main platforms at the London end. Closer to my home there is also a bay, used for overnight stabling, at Ryde St John’s Road.