Hasn't been mentioned here, but this week until Thursday, trains are not running between Highbury & Islington/New Cross Gate after 2200. Trains from London Bridge are still running, and there will be a NXG - West Croydon every half hour. This is due to the station redevelopment works at Surrey Quays. (New station entrance, lifts etc). Expect random/full line closures until next year in evenings/weekends.

Last train from Canada Water to Forest Hill Tuesday 18th July to Thursday 20th July departs Canada Water at 2153. After that, you'll have to go to London Bridge to get a Southern service.