In 1877 H Chambers commenced a horse-drawn bus business in Bures. In 1918 the first bus was purchased to operate a twice weekly service between Sudbury and Colchester. By the late 1930s routes were operated to Halstead and Haverhill. It also diversified into the haulage business, Chambers exited from this business in the 1960s.
In June 2012 Chambers was sold to the Go-Ahead Group with 27 buses. The depot was not included in the sale with operations moving to fellow Go-Ahead company Hedingham Omnibuses in Sudbury although it still trades under the Chambers name.
As at October 2010, Chambers operate seven services. Both urban and rural areas are served, many of the company's routes running into Sudbury, and serving the bus station near Sudbury railway station. It also operates coach charter services.