I think it's been discussed on this forum before and some member said he had some documentation to support it.
Apparently, it's mentioned in a pilot memoirs book that the entire squadron of Spitfires was disappointed when they got their radios upgraded, because they were no longer able to tune in to radio stations.
Also, i've recently read BF-110 aces from the Osprey aircraft of the aces series, in one of the accounts/interviews Werner Methfessel, a 110 pilot who participated in the initial Polish campaign, while on an escort mission over Warsaw clearly states that he instructed his radioman to tune in to the local radio station:
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