... i am still amazed that such sensitive military monovers are readily available for all to see...
Eh?
Er, I think you'll find the data on Flighradar24 is civilian air traffic. Click on a few - I doubt you'll find many Typhoons, Tornados, Hawks or Tucanos. The planes nearest to Valley right now are a 767 flying from Manchester to Toronto, an A320 from Dublin to Stuttgart, and a 777 heading for LHR from Chicago.
I believe the positional info published by Flighradar24 is from each aircraft's transponder and could be picked up by anyone with a receiver. I understand the route info comes from published sources such as airlines. The service is used widely by the aviation industry as well as by enthusiasts the site claims a million hits a day.