I have just recently attended a course which was set up by a Police ASU. The unit was the Central Counties Air Operations Unit in Birmingham. This was done by a guy called Craig Guis, (probably spelt wrong), who is an ex military US army helopilot.The course was superb and very interesting. Worth giving the CCAOU a call. Can't help with the number at the moment as I'm at home and the details are at work.