Radio reception dies when Rear Screen Heater Turned on 2008 S80

[fixit9660]

Hi All,
My Radio reception is fine until I turn on my Rear Screen Heater, then it dissolves into static. Anyone got any ideas please? I bought the car very recently from a Volve Main Dealer.

It's a 2008 S80 3.2 Lux Auto.

Thanks,

Andy.