The first point of call for all radio stations wishing to broadcast on AM or FM is Ofcom, the communications regulator in the UK. For more information, please refer to the Ofcom website.
If you want to set up a community radio station that broadcasts online only, you can find further information on the online licensing page and the PRS for Music website.
For online stations, you must purchase separate PPL and PRS for Music licences to cover any music included in your broadcast.