For the Americans in the audience (including myself) - the "mosquito alarms" he talks about are an anti-loitering mechanism commonly employed in UK shops and malls that hate teenagers. In America this was called "Mosquitone" and were actually used by teenagers in schools to disguise their cellphone ringer from teachers. It was a big thing a few years back when I was in school, at least.<br><br>(Also, what the hell is with London and anti-loitering technology? I've never heard of anyone using mosquito alarms, uncomfortable benches, or anti-climb paint in the US... maybe I don't live in enough cities.)