Starting this Saturday, 25 July, and for the whole of next week there will be nine days of changed times, longer journeys and diversions to Southeastern services from Sevenoaks.
Basically on the off-peak pattern fast trains on the Ashford/ Ramsgate route will be diverted to Victoria (journey time from Sevenoaks to Victoria around 35-40 minutes) and fast trains on the Tunbridge Wells/Hastings route will go to London Bridge and Charing Cross via New Beckenham (journey time around 35-40 minutes). Times of departure from Sevenoaks have changed a bit, and times of departure from London need to be checked.
Peak hour services appear a bit more complicated and need to be checked.
This is due to a major signalling switch-over at Hither Green. At least it is getting done while fewer people are travelling!