Last fall I purchased a 7-day metro travelcard which was put on the Oyster card. I still have the Oyster card. This time I will only be in London 3 days. I'm guessing an Oyster card is an Oyster card and there isn't any difference between paying a deposit and getting one vs. getting the 7-day travelcard, but I figured I would ask.
Can I refill it? Or do I need to get a new one?