That's fantastic David. According to the the farmer that owns it, he has a gun and you need to be married to his daughter to get in. That must reduced the number of visitors a bit.
Something certainly kept visitor numbers low
It was the most bizarre experience, actually. Lots of interest, loads of old communications equipment to look at (they had a real kilosteam box!), and seeing the old 'Protect and Survive' videos was quite chilling. But the place is run in a rather strange way. You pay for admission at the end, in an honesty box, but they have signs all over the place saying "there are cameras, you are being watched, if you don't pay we'll get you". The only staff we saw were the guy who I assume runs it and his son who were keeping the self-service canteen running.
There's a recording studio in there, the radio kind where the BBC would have broadcast to the nation in the event of a nuclear strike. They had a waxwork BBC announcer in the booth - Huw said "oh look, Dad, he's doing the latest episode of the European Perspective". Probably playing something apocalyptic, like Magma...
I don't know if it would bear many repeat visits, but it was interesting, and only forty minutes from home.