'There seems to be a small proportion of people who react badly to wireless networks,' said Alasdair Philips, chairman of independent watchdog Powerwatch and a member of the Government's Stakeholder Advisory Group on extremely low frequency electromagnetic fields (Sage).

'For example, I’ve seen several doctors and dentists who have put wireless LANs into their surgeries and then had complaints from staff who can feel something in their head or can’t concentrate properly.But when they’ve taken out WiFi and put cable in, the problem has disappeared.'

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