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SI: I recommend buying the oysters either the day of or the day before. East Coast oysters have up to a two-week shelf life, and West Coast oysters have up to one week, but I don't really recommend buying them that far in advance. DA: When purchasing oysters, a good rule of thumb would be to buy oysters that are close to your region.
If you buy an Oyster card in London you pay a deposit (Â£5 in 2015) which is refunded when you surrender the Oyster card. The standard Oyster Card allows you to load Travelcards onto them (but not 1 day Travelcards) which if you are in London for more than 5 days will probably save you money.f you are a short term visitor (in London for up to 14 days) with kids between 11-15 you can take advantage of the Young Visitor Discount. This means you can get half price fares on an Oyster Card on a temporary basis for your child without going through the hoops and expense of getting an Oyster ID card.