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In addition to its financial woes, Bletchley Park faces another foe: housing developers.
Ever since the government's early tussles at the start of the war, when it evicted the local property tycoon, Bletchley Park has faced many battles to keep developers at bay.
Two years before Bletchley Park re-opened to the public in the early 1990s, it seemed that its existence was under threat. In 1991, the site was almost empty and plans had been drawn up to redevelop the whole site as a housing development. The site's proximity to Milton Keynes and the M1 made it an attractive prospect for such schemes.
It was only after a highly successful "farewell" party for the site, attended by 400 former codebreakers, and the formation of the Bletchley Park Trust in 1992 that the developers were halted.
Milton Keynes Council declared the site a conservation area in February 1992 and the landowners — the government's land agency and BT — withdrew all planning applications. Seven years later, former Bletchley Park Trust director Christine Large landed a deal with certain developers to secure the future of Bletchley Park in the hands of the Trust.
But some developers remain far from dissuaded, recently winning the right to build houses even closer to the wartime facilities. One of the site's exhibition facilities now rests just 10 yards from 21st-century residential properties.
With giant concrete mixers towering over the edge of the Trust's land, Greenish said he feels the remaining green space between Bletchley Park and surrounding surburbia may be lost, though he plans to fight the advance tooth and nail.