After the last Southern trains have run on Christmas Eve there will then be no Southern service from Forest Hill/Honor Oak Park etc to London Bridge / Victoria / East Croydon until Monday January 10th (was originally due to be Tuesday January 4th). This is due to Network Rail’s ongoing work to modernise the 1980s track and signalling into Victoria station which results in the closure of the tracks used by Southern and many of the Victoria services being rerouted to London Bridge instead and the ongoing effect of coronavirus isolation and sickness.
London Overground won’t be operating on Christmas Day but will be operating from December 26th.