Yes, they can be anonymous in the sense that you can buy one in person and top it up without an ID [1]. [1] https://tfl.gov.uk/fares/ways-to-pay/where-to-buy-t

Yes, they can be anonymous in the sense that you can buy one in person and top it up without an ID [1]. [1] https://tfl.gov.uk/fares/ways-to-pay/where-to-buy-tickets-and-oyster#on-this-page-0 https://tfl.gov.uk/fares/ways-to-pay/where-to-buy-tickets-an...