Quite sadly, I just read said Act (Uni exam revision...mmmm) and couldn't seem to find anything that may relate to the broadcasting of ATC on the internet. (Maybe as it was passed in 1989) The
Official Secrets Act can be found here. Please say if I'm wrong!
Seems odd that the US, possibly the most security concious country in the world allows such extensive broadcasting, but we don't.
M330