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Though Turing's hut has been restored to its former glory, most of the remaining huts are deteriorating. Despite the fact that they have listed-building status, due to their historical importance, most of the huts are uninhabitable, including this one, in which codebreakers focused on breaking code sent by the German high command to the army and air force.
"The site is deteriorating; the mansion is crying out; a lot of it is old and decrepit," said Simon Greenish, the Trust's director. "We're having to do something to the mansion roof — it's got 16 leaks just in one part of the roof — but we can't deal with all of that."
The Trust is just about surviving on revenue from its 60,000 annual visitors — entrance to the site costs £10 for an adult — in addition to income from renting out those buildings on the site that remain habitable.
Greenish is also pursuing the possibility of funding from the Department for Culture, Media and Sport and Milton Keynes Council, the local authority.
"This is such an important site. The government is largely responsible for the state it's in anyway, because it's a government site," Greenish said.
Greenish said he is attempting to work around the National Lottery's eligibility criteria for funding and also hopes that Microsoft's founder will come to the site's rescue: "I'm really looking for a personal link to Bill Gates."
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.
Bletchley Park supplements its income from visitors by hosting a range of conferences and weddings. While many of the wartime huts are rotting, the insides of the Victorian mansion — including the ballroom, billiard room and the library — remain luxurious. A full wedding ceremony and reception in the ballroom (pictured) costs £3,250.