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A person touches an Oyster card reader at a London Underground station with an Oyster card, Stock Photo, Picture And Rights Managed Image. Pic. WEN-34001113 | agefotostock
![The very important reason why all London Underground passengers should check their Oyster Cards right now - MyLondon The very important reason why all London Underground passengers should check their Oyster Cards right now - MyLondon](https://i2-prod.mylondon.news/incoming/article21554584.ece/ALTERNATES/s1200c/4_Oyster_Card_N-Hertford_startion-5.jpg)
The very important reason why all London Underground passengers should check their Oyster Cards right now - MyLondon
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Does anyone know what this means? 'Your Oyster card has been stopped and can no longer be used' : r/london
![Standard ticket entry point & reader machine for Oyster card passengers on the London Underground, London, UK Stock Photo - Alamy Standard ticket entry point & reader machine for Oyster card passengers on the London Underground, London, UK Stock Photo - Alamy](https://c8.alamy.com/comp/C3P005/standard-ticket-entry-point-reader-machine-for-oyster-card-passengers-C3P005.jpg)
Standard ticket entry point & reader machine for Oyster card passengers on the London Underground, London, UK Stock Photo - Alamy
![London, UK. 23 Dec 2020. Oyster card, travel card, Transport for London, London Underground. Credit: Waldemar Sikora Stock Photo - Alamy London, UK. 23 Dec 2020. Oyster card, travel card, Transport for London, London Underground. Credit: Waldemar Sikora Stock Photo - Alamy](https://c8.alamy.com/comp/2DX451B/london-uk-23-dec-2020-oyster-card-travel-card-transport-for-london-london-underground-credit-waldemar-sikora-2DX451B.jpg)