It is a Weir W-6. A Scottish Company.
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With the assistance of Juan de la Cierva, the Weir Company had formed an aircraft department in Scotland in 1932. The W-5 was the Weir Company's first true helicopter design. Initially, the W-5 was a coaxial design, but concerns about stability and control as well as the success of the Fa-61 led to the redevelopment as a lateral side-by-side configuration, which flew successfully in June 1938. Control was achieved with cyclic pitch but there was no collective pitch; vertical control was obtained by altering the rotor speed, a cumbersome feature used also on the Fa-61. The W-5 reached speeds of 70 mph in forward flight. The Weir W-5 (and later the W-6) and the Fa-61 were technically ahead of Sikorsky's VS-300 in terms of flight capability, but the VS-300 was ultimately to set the new standard for helicopter design. The Weir W-6, which first flew in 1939, was a much larger version of the W-5 but still used the lateral side-by-side rotor configuration. Further work on the Weir designs was suspended at the outbreak of World War 2.
http://www.enae.umd.edu/AGRC/Aero/history.html
Six of seven YB-24s built and twenty B-24As were transfered to Great Britain for use beginning in March 1941. These planes were redesignated LB30 and given standard British serial numbers. LB was short for Liberator British. The US Army adopted the Liberator nickname for its B-24s.
http://www.wpafb.af.mil/museum/research/bombers/b2-34.htm