Can anyone explain to me why the Thameslink train (not Gatwick Express) costs 19.90 pounds to go from Victoria Station to Gatwick Airport while the St Pancras Int'l train only costs 10.70 pounds. Keeping in mind that the tube costs 2.70 pounds to get to St Pancras from anywhere in zone 1.
Aslo, I purchased the Thamelink ticket online for Gatwick to St Pancras with anytime return. I have since change my hotel which is closer to Victoria station. Do I just take my ticket to the ticket booth and pay the extra 9.20 pounds?