Trust me, neither do we. It's an archaic old law, and nobody has ever been prosecuted for listening to atc comms.
Even airport police turn a blind eye to enthusiasts at the airport listening with scanners.
However, feeding it is slightly different. If you stream it to a website such as this one, you are likely to hear a knock on your door from OFCOM telling you to cease and desist. However, recordings posted after the event seem to be OK. I've posted a couple, as have others, and have never had any problems.