I will be arriving in London heathrow airport on 8.25pm, and I am looking for a train to Canterbury east railway station.
My search gives me this, however, On the status column there is a warning:
Ticket purchases & collections from London Heathrow. Through tickets from London Heathrow terminals to National rail stations where the journey begins on the Underground are not available to purchase or collect at London Heathrow.
What does this mean? And how can I purchase the ticket? I can't seem to purchase it online