Hi again, the Manchester App freq is 118.575 which is manned 24hrs, the Director freq is 121.350 and is only active when needed.
I suppose I will have to dodge PC Plod for giving this information.... Which reminds me of a document circulating RAF Sealand. It was how to calculate Resistance knowing Voltage and Current... (i.e. teaching Ohms Law.) which was marked 'Classified'.... Hope the Russians never found it...