With usage at Clapham High Street being 1 million, higher than both Penge West and Anerley, isn't it time Southeastern began calling some services all day? It could be:
The only problem I can think of is platform lengths as trains get up to 10 cars but lengthening is possible west to about 8 cars.
The two London Victoria - Dartford via Lewisham & Bexleyheath trains which already go through the platforms
Or two of the four London Victoria to Orpington services
Or both (which would make roughly a 15 min frequency with its current timetable).
The only problem I can think of is platform lengths as trains get up to 10 cars but lengthening is possible west to about 8 cars.