Wilton Park

They've got microphones hidden everywhere, and they're there from when they're captured at various points, 1943, after D-Day, in June '44, until the end of the war, and we are picking up all this.

So that was a very different scenario to the other two sites, Latimer House and Wilton Park in Buckinghamshire, and these were reserved for lower-ranked prisoners who were there for just a few days.

The intelligence services constructed a sort of single story army building at both sites behind the mansion houses, and that's where the M room was, M for miked, where the secret listeners were.

So they were actually behind the cells, behind the interrogation rooms.

They don't know what they're doing.

But it was all designed to make them relax.

And of course, when they go back to their cell, i- in the case of Latimer House and Wilton Park, they give up to their mate.

They're chatting about, "Well, I didn't tell the interrogator this." "Well, did he ask you that?" "No.