Facial recognition technology is too prevelant in the UK and is not being properly regulated, according to privacy NGO Big Brother Watch. Big Brother Watch said the Meadowhall shopping centre in Sheffield had used the technology in a trial, and that it had also been used at Liverpool's World Museum and Birmingham's Millennium Point conference centre.It comes after an investigation was launched this week into the use of the controversial technology at King's Cross in London.”There is an epidemic of facial recognition in the UK,” said Big Brother Watch boss Silkie Carlo.She added: “We now know that many millions of innocent people will have had their faces scanned with this surveillance without knowing about it, whether by police or by private companies.”