Midland331 - Know what you mean! Happy days. I used to love it when I first went there, but after 20 years it got a bit tiring for an old fellah. Many, many moons ago - I'm talking 40 years - I worked in a department which did analysis of telephone and R/T usage at ATC units. GMC at Heathrow was one of the busiest ATC positions in the UK where 59 minutes out of every hour was R/T time. During that hour the controller also carried out a massive amount of liaison with his colleagues. I dunno how we/they did/do it, but I think it's to do with mirrors..