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I was having a little look around RealTimeTrains, when I stumbled upon this service, which seems to run every day this Monday to Friday. Is there a reason for this?
...so It is formed from an ECS arrival from Cannon St 5U93, having taken the long way round via Blackfriars carriage sidings and Elephant and Castle, with a 1 minute dwell at Denmark Hill, so the problem must be a short term issue with capacity in the Cannon St or London Bridge area:
There is a longstanding tradition of a summer holiday extra on this route, historically using stock that would have been running ECS to Ramsgate anyway (can't access WTT just now to check, I'm going back a generation). Interesting that there are two workings this year from the Catford Loop, don't recall that before.