What is the single bus fare in central London when using an Oyster card?

The single bus fare in central London when using an Oyster card is indeed £1.75. Using an Oyster card allows for discounted travel compared to cash fares, which is part of the Transport for London's initiative to encourage contactless payments and streamline fare collection on public transport. The fare reflects a flat rate for bus journeys, making it cost-effective for travelers and residents alike. This price is set to provide an easy and economical option for users, thus enhancing the public transport experience in London.

Additionally, it’s worth noting that fares can vary depending on payment method and type of transport, but the specific context of the question is about bus fares with an Oyster card, making £1.75 the correct and relevant figure. Other options listed do not accurately reflect the current fare structure for buses in central London using this payment method.