Northern line extension adds a new station to the Cross-London interchanges

The opening of the Northern line extension to Battersea has caused a change to the list of Cross London Interchanges that are permitted for people using National Rail.
A Cross London Interchange is a ticket that allows someone to travel by train into London, and cross London to another National Rail terminus using the London Underground or DLR. So for example, someone travelling between Hastings and York with an interchange ticket could arrive from Hastings at London Victoria and their ticket wi