Listening to the radio at work? Prepare to be sued

MLCT writes: The Performing Rights Society, one of the UK's royalties collecting societies, has taken a Scottish car servicing company to court because the employees are alleged to have been listening to the radio at work, allowing the music to be "heard by colleagues and customers". The PRS are thus seeking £200,000 in damages for the "performances of the music" which they claim equates to copyright infringement. The judge, Lord Emslie, has ruled that the case can continue to hearing evidence, commenting that the key point to note was that music was "audibly 'blaring' from employee's radios". Where do the extents of a "public performance" end? Radios on in cabs? Sitting in my house with the window open listening to the breakfast show?