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Sadiq Khan set out plans for a one-hour bus ticket today which would allow passengers unlimited journeys within a 60-minute window.

The Labour mayoral candidate said the ticket, to be called The Hopper and costing £1.50, would help people who rely on multiple buses to get to work.

Boris Johnson rejected Lib-Dem proposals for a one-hour ticket in 2009 saying it would be too complex and costly.

A single fare now costs £1.50, capped at £4.40 a day on Oyster, but if a passenger changes bus they pay again.

Mr Khan, travelling with shift worker Joseph Sarpong to his job at B&Q in New Malden, said: “It was a journey he [Joseph] does twice a day and under the current system it costs him £5 there and back because he uses two buses each way.

"This can’t be right.”

Labour sources said the ticket was technically possible and would cost £25 million a year.