London will receive its first Enviro 400 buses in December 2005/ January 2006 when Metroline introduces this new bus type (most probably on route 4, which still has standard floor buses). Pictures of how this bus looks are here:
http://www.busandcoach.com/107news1.html
http://www.alexander-dennis.com/news/news_product_story2.htm
http://www.busandcoach.com/107news1.html
http://www.alexander-dennis.com/news/news_product_story2.htm