What follows in an email from Southeastern:
Network Rail has advised that due to an ongoing points problem at London Cannon Street, work will continue this evening to resolve the issue.
As a result:
The following Southeastern services between 16:46 and 18:44 from Cannon Street will now depart from London Victoria:
16:46 Cannon Street to Ramsgate
17:08 Cannon Street to Ramsgate
17:30 Cannon Street to Ramsgate
17:52 Cannon Street to Broadstairs
18:14 Cannon Street to Ramsgate
Metro services departing Cannon Street are unaffected.
London Underground will accept Southeastern tickets via all reasonable routes between 16:00 and 19:00.
Passengers are advised to also consider alternative routes departing from London Blackfriars and check for changes to services before travelling with National Rail Enquiries: www.nationalrail.co.uk