A pirate radio station based from a suburban terrace in Stonecot was shut down in a raid this morning.
Police and officers from communications regulator Ofcom swooped on the house in Morley Road today.
They found a PC hooked up to a tool called a link transmitter that allowed users to convert an internet signal into a radio signal.
The person who set up the system was using the kit to broadcast FM radio via a link to an aerial on the top of Chaucer House in Central Sutton.
It is believed the person who set up the system was charging DJs to let them broadcast via it.
Officers shut down the system and seized the equipment from both the house and the top of Chaucer House.
No-one was arrested.