Tony Carroll, left, a Bletchley volunteer tour-guide
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Bletchley Park's bitter dispute over its future

27 January 2014 Last updated at 15:45 GMT

The groundbreaking intelligence work carried out at Bletchley Park during the second world war was credited with bringing forward the end of the conflict.

In 2011 the site was awarded a £4.6m grant from the Heritage Lottery Fund (HLF).

But Bletchley is currently in the throes of a bitter dispute, between owners who want to create a brand new visitors centre, and volunteers who have been working on the site for years.

Jeremy Cooke reports.