'Illegal in UK & Ireland', well I'm not sure. If you visit any airshow you will dozens of spotters with airband radio. They are easy to obtain & I've never heard of a prosecution, unless for a unlicensed transmitter. I gather they don't allow internet streaming though, presumably this counts as re-broadcasting. However, I believe you can get Irish ATC streamed. I used to advise students to listen to it to aid their RT!