Bit of an odd query this...
I work in the utility industry, and have been getting ongoing daily queries from a member of the public (lets say its a "he") as to ill- effects they say they're getting after being in their house for an hour or so around certain times.
They have "issues" with a neighbour who is a gas fitter / plumber due to some previous unspecified incident, but think *he* is causing whatever is making him feel ill (headachey, nausea, tingly pain in his legs). He says he can no longer stay in the house overnight (or for more than a couple of hours) because of the way it makes him feel.
It would probably be fair to describe their logic and reasoning to be "erratic" which would appear to tie in with the HSE website's symptom list, although i'm not sure if they'd been in the house prior to speaking to me :-}
Mention was made of the sound of running water prior to feeling ill, which lead me to think it might be central heating related - aka fume spillage from either his or his neighbours' installation.
It strikes me as being an "environmental" effect rather than his talk of some sort of electrical / electronic disturbance...
Does anyone have first-hand experience of the symptoms of CO - what did you "get" ?
FWIW i've already suggested it could be CO and *dangerous* - so he took himself off to WHSmiths to buy a CO detector (don't ask - I printed off the *WOOLWORTHS* webpage with a detector on it so he knew what he was looking for - and where - as you can tell he's a little puddled...)
I also suggested calling the BG emergency number, which I believe he is keeping in mind.
Any thoughts ?