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Possibly to dig a hole as this is a possibility due to the high radon gas in the area, a radon sump might be needed. Yap the current owners have never done a test and nothing has been done about it and they have 2 yong kids!!!
IIRC Radon is one of those things that sounds scary but really isn't when you get into it. Even if you double the chance of a rare thing happening it's still very rare.
I think as long as the kids aren't heavy smokers they will be fine. I certainly wouldn't be paying the Radon industry £xx k to install a woo-woo box.
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