The bus - to enhance public awareness about our environment, WWF Hong Kong launched a WWF Hong Kong Green Bus Competition in October 1995. The competition was divided into three categories - Primary, Secondary and Open with themes set on "Save Our Seas", "Discover Mai Po" and "Invest in Our Future" respectively. The winning designs were painted on three double-deck buses to carry the important message of environmental conservation to different parts of the territory.

The winner of the Primary section was a Primary Six student aged 12. His winning design had converted the bus into a giant whale swimming happily with many other varieties of marine life. The young artist said that whales were the largest creature in the ocean and the umbrella of other marine life, and humans should be the ones to protect the environment. The Green Bus with the winning design of "Save Our Seas" category operated from Sheung Wan to Ma On Shan.

LM4 was one of a batch of ten - CMB's last non-air conditioned buses. These ten vehicles entered service during December 1993. All ten vehicles were transferred to New World First Bus in September 1998, however, as part of that Company's policy of withdrawal of non air-con buses, the whole batch was withdrawn early in 2000. 
In July 2000, the batch arrived back in the UK, having been completely refurbished, repainted and converted to single door, for operation by First PMT. They were subsequently transferred to First Manchester, operating mainly on route 17 from Manchester Arndale Centre to Rochdale.