Payment through PayPass will cost the same as having paid on Oyster - including the discounted rates. From 2013 that's £1.40 for a single ride. However, unlike using an Oyster Card, there are no daily limits. Cash payments will cost £2.40 from 2013.
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Detectives are hunting two thugs armed with wooden stakes who left a man with multiple head fractures in a vicious attack.
Police have launched a manhunt following three attacks on women in south London that detectives say may be linked.
Khan, the Labour MP for Tooting, claims his plan to hold fares at 2016 prices until 2020 is fully costed.