True enough CB, I'll have to get myself down to the optician's again!
Actually, after I posted it, I did notice that I was repeating your info but I decided to leave the link there anyway.
I like the story on the site about the fun they had with the radio frequency. The CAA allocated them a frequency which they then discovered was the same as Gatwick Approach. They pointed this out to the CAA who informed them it was Gatwick's problem and measures were being taken at Gatwick to sort it out!
Floaty