Then they went after a children's charity for singing Christmas carols without paying up.
Then they went after a police station because some cops were listening to radios. That's a public performance, according to PRS. Over the years, we've had stories on PRS threatening car repair shops, because mechanics in the garage were playing their radios loud enough that customers in the waiting room could hear them. But, where PRS really shines is in threatening tons of small businesses. PRS is also the group that has caused music videos to be pulled from YouTube after demanding much more money than was economically feasible.
When I was in the UK recently, I was surprised to hear just how much most folks hate PRS - the collections society in charge of getting various businesses to pay for playing music.