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In page Optare Esteem:

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Metrobus had the largest number of the original East Lancs Esteems, some of which were on Scania N94UB, Scania N230UB and MAN 12.240 chassis while 21 on Alexander Dennis Dart SLF chassis were purchased for Transport for London contracted routes.[8] The first two Esteems to be built on the Alexander Dennis Enviro300 chassis were delivered to Courtney Coaches in 2006, and were the first Enviro300s with bodywork not built by Alexander Dennis.[9]