A bus company has launched its own Oyster-style card system on its services.

Carousel Buses says its new travel smartcard called 'The Key' will save passengers time and money.

Passengers will be able to pay for their travel in advance by putting credit on the pass online and in travel shops.

They will work in a similar way to London's Oyster card system - with passengers tapping The Key onto a card reader when they board the bus.

Passengers can use The Key for single and return journeys, or purchase 12 trip bundles, or weekly or monthly passes for various travel zones.

Phil Southall, Carousel Buses managing director, said: “This is the next step in our ongoing strategy to make bus travel as accessible and convenient as possible for passengers. "Smartcards are a very popular product, easy to use and save time and money, so we’re delighted to be further improving our service to our customers.”

Bucks County Council's transport chief, Cllr Mark Shaw, said: “The Key is Buckinghamshire’s first smartcard scheme on the buses and we are delighted that this technology will improve passengers’ journey experience and provide a more affordable and convenient way to travel.

"Buckinghamshire County Council continues to work with bus companies to help improve the quality of services on offer and encourage bus use.”