Saturday 10th December:

Southern: Normal service.
London Overground: Normal service.
Southeastern (Hayes line): Replacement buses between Lewisham and Hayes.
Thameslink (Crofton Park/Catford): Trains every 30 minutes between Blackfriars and Sevenoaks.

Sunday 11th December:

FIRST DAY OF NEW TIMETABLE.

Southern: Normal service.
London Overground: Normal service.
Southeastern (Hayes line): Replacement buses until 0830, then a normal train service between Charing Cross and Hayes. (For Cannon St change at London Bridge).
Thameslink: Trains diverted to Victoria. (Tickets valid on tube/buses to St Pancras International).