Possible Clues:

• Just The Specials' kind of Klub
• Many happy, or unhappy, returns, by the sound of them
• Mountain sounds
• A resounding success for The Rapture?
• They give one a good return, by the sound of them
• 22 down, by the sound of them
• They repeat whatever you say
• Comes back
• Audible bouncebacks
• Slavishly copies city gardens