Garden City principles were reasserted by the "New Townsmen" (Howard, Osborn, Purdon, and Tayler), who, referring to the success of Letchworth, proposed 100 government-supported new towns to address post-war rebuilding. However, the need for post-war housing resulted in new suburbs being prioritised over towns for the next two decades, with some four million high standard houses built in between the wars. Conversely, some attempts were made at designing rebuilding efforts as satellite towns such as Manchester's Wythenshawe and Liverpool's Speke and Knowsley, which also included provisions for industry. Nonetheless, these were still extensions of existing cities and not true New Towns. Furthermore, three-quarters of all the new housing was built privately meaning a default bottom-line approach was adopted into the inter-war development efforts. During the inter-war years, the government created committees to study the problem of urban concentration. For example, the Committee on Unhealthy Areas, chaired by Neville Chamberlain (1919-1921), recommended the restriction of further industry in London and the relocation of some of the city's existing industry to garden cities. These studies became the origin of Chamberlain's urban decentralisation interests which led to his setting up of the Barlow Commission when he became Prime Minister. Further important advances included a 1935 Departmental Committee recommendation for the building of new towns in line with garden city principles, and a 1936 Special Areas Report reiterating the idea that no new industry should be allowed in London which gained public and political interest. Barlow Royal Commission In 1938, Chamberlain, as the new Prime Minister, assigned a Royal Commission chaired by Sir Anderson Barlow to study the urban concentration of population and industry. The resulting report raised the problem of large towns as a public issue for the first time and concluded that "planned decentralisation" was favourable for national interests. However, owing to the outbreak of war in 1939, the 1940 publication of the Barlow Report was initially ignored due to more immediate priorities. However, it eventually became a turning point for New Towns policy. The damage brought on by the Second World War provoked significant public interest in what post-war Britain would be like. This was encouraged by the government, who facilitated talk about a "Better Britain" to boost morale. The Barlow Report was quickly turned to as a best practice document. In 1942, following the report's recommendation, the Government chose to create a central planning authority in the form of the