"Boris Johnson will not renew anwith which provides cheap fuel for London's
buses once the agreement ends later this year. The mayor of London said
half-price bus and tram fares for 250,000 Londoners on income support, which
was also funded by the deal, would still be honoured. Mr Johnson said he
thought many Londoners were uncomfortable with how the scheme was funded."

Always seemed a bit odd to me...

http://news.bbc.co.uk/1/hi/england/london/7419227.stm

Paul