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PS: Does that mean that the laws tracking over uk airspace have been relaxed.. as some time ago one could not do that, unless you have your own AIrNav system.
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They way that I had it all explained to me was something similar to ...
Those Airnav/radar-box/whatever trackers are using the signals transmitted by the aircraft themselves; some/many of the signals include the lat/long of the aircraft, and the program uses this data to plot their position and track on a map. The nature of the aircraft transmission is that it is a 'broadcast' (that's the 'B' bit of the ADS-B acronym), so the signal is available to everybody - those who it is intended for, and those not.
On the other hand, the voice transmissions from ATC to aircraft, and vice-versa, are destined for each other (and, to a degree, other aircraft on a given frequency). They are not 'broadcast' and therefore not available to everybody.
Hence, it you re-broadcast (across the Internet) the audio from your ATC scanner, you are breaking the law. However, if you re-broadcast a signal which is already defined as being 'broadcast', you are not.
Having said that ... when you look at the Internet and see a map of (say ...) the UK airspace and see a number of 'blips' moving around, you're not actually seeing/hearing the bradcast signals, you're seeing the results of a computer program which is interpreting the signals.
