Radio doesn't work

Hi there,
Newbie here. I've had my 2004 1.5 SE petrol for a couple of weeks. An old lady had it from new and it has only covered 32,000 miles. Everything so far, so good. Except, the radio has just started to lose channels and today no signal on either waveband. The integrated aircon and heater controls work, as does the CD. Is it possible to replace the radio/CD unit rather than fit an aftermarket one? If so, where's the best place to get a replacement? Many thanks guys and gals
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