30m sits unused on London Oyster travel cards - BBC News
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Crossrail: All the Elizabeth line stations you cannot use an Oyster card at - MyLondon
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Transport for London - 11-15 Zip Oyster Photocard expiring in September? It's time to apply for a 16+ Zip Oyster Photocard. Applying online is the quickest way to get your card. Apply
London's Oyster card: Are its days numbered? - BBC News
Collectors Transport For London Single Logo Oyster Card VERY Rare NEW & Unused | eBay
16+ Zip Oyster photocard - Transport for London
London Underground: Men caught selling £56k of illegal Oyster cards on social media - MyLondon
