Hey, don't worry.
If I am right, at the moment it is:
2 trains an hour to Three Bridges
4 trains an hour to Sutton of which;
2 are via Wimbledon
2 are via Mitcham Junction
2 trains an hour to Sevenoaks
That creates an 8tph service at present.
In the new timetable it should be:
2 trains an hour to Gatwick Airport
4 trains an hour to Sutton;
2 are via Wimbledon
2 are via Mitcham Junction
2 trains an hour to Orpington via Crofton Park (does this service start here or Kentish Town?)
2 trains an hour to Rainham Kent via Greenwich
If the service is from West Hampstead, then that boosts to 10tph, if not then it stays at 8tph.
The current Sevenoaks via Crofton Park service will terminate at London Blackfriars from 20th May with the intention of extending it to Welwyn Garden City at selected times from 2019.