If you are referring to FM Radio, I wouldn't worry about the analogue being switched off just yet - It is only the TV that is being switched off in the so-called "Digital Switchover" The government's target for "switching the analogue radio off" isn't until 2015, and there are people who don't think it'll actually happen that soon:
The great FM radio switch-off: Don't Panic! @ The Register
Furthermore, FM will still be used by local radio stations - though with any luck this will exclude "local" radio stations owned by national companies, whose only DJ for most of the time is a computer