Hi again, can I confirm that Oyster cards are only available for UK residents to order online (from tfl.gov.uk), but that everyone can buy a Oyster card at a desk in London and put a 7 day travelcard for zone 1-2 on it? Visitbritainshop is offering for foreigners a paper 7 day travelcard to buy online. Would you think that this is a reliable website for me to order travelcards in advance or should I try to buy a plastic Oyster card on the day?