From today London buses will accept contactless bank card payments as an alternative to an Oyster card.
Passengers who swipe their bank card will be charged the same as Oyster pay-as-you-go.
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Rahman was ejected from his powerful job in April by an Election Commissioner after being accused of corrupt and illegal practices.
The service was due to start in September but there is no agreement on pay and conditions such as how many night shifts staff will work.
Would you know what to do if you needed help? Here's the official advice from the Foreign Office.