Trent Park House, in north London, looks every inch the elegant country mansion. Today, those stories are finally being told in the new Trent Park House of Secrets museum. As part of the redevelopment, the restored state rooms on the ground floor and the wartime intelligence rooms beneath them have been preserved as a museum. One of the first exhibits is a large-scale model of Trent Park, illustrating how the listening operation was carried out throughout the building. The museum, Trent Park House of Secrets, is open now from Tuesday to Sunday from 10am to 5pm.