When you leave London, you have the choice to get a refund on your Oyster Card for any unused credit score that’s left on the cardboard. You can also maintain the card for a future visit as the credit never expires. If you had a Visitor Oyster card and should return to London, this might be a better option on the activation payment of £5 is non-refundable, so that money is misplaced. For a standard Oyster card, the £5 deposit is added to your card as credit score a year after activation, so you must undoubtedly hold onto it for a future journey to London. Register your card online, and high it up on-line utilizing a credit or debit card. For a long time this was only possible with a UK address, however this has now changed and the system accepts worldwide addresses as well.