This was on the Today Programme, BBC Radio 4 in the UK, on August 17th 2012.
"Richard Deakin is Head of National Air Traffic Services (NATS), the British agency responsible for national Air Traffic Control and national air safety.....Head of UK Air Traffic Control Richard Deakin is responsible for making sure over 6,000 flights move safely through the airspace every day.
During an interview with the Today programme's Simon Jack, he was pressed about whether his staff encounter unidentified flying objects. Deakin confirms on air that Air Traffic Control routinely tracks objects that do not “conform to normal traffic patterns”, with a frequency of roughly “one a month”."
http://news.bbc.co.uk/today/hi/today/ne ... 745210.stm
http://structuredcraft.com/2012/11/19/h ... -activity/