Southeastern "London's most expensive trains"

853blog reports that thanks to the New Year price hikes, Southeastern services are now the most expensive in London:

Even in Zone 2, passengers from Deptford [and St Johns and New Cross] are charged £48 a year more for an annual ticket for a rail-only journey to central London than their counterparts who use the frequent service at Clapham Junction. Both stations charge £4.40 for a day return on Oyster.
In zone 3 [Crofton Park], Southeastern is charging £52 more than most other companies, after hiking up the cost of an annual ticket by over 12.5% to £856. Passengers on sister company Southern pay £840 each year, while South West Trains’ charge varies. First Capital Connect, First Great Western and National Express East Anglia sell their annual zone 3 tickets for £804.