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thanks for replying all,
to clear up some points...
The radio is pure late 1980's analogue so there will be no issue with reception for either band. That part of the unit I am not concerned about.
I've solved the issue of input voltage with a 240-120 50W step down transformer. - tick
The only issue is if it the clock oscillator derives it's timing from the power source or has an inbuilt, self-contained oscillator.
I've been advised today by an authority in the field that often the clock chip in these bog-standard bedside clock radios have a dedicated pin which is connected to either ground or rail voltage, depending on whether it is running on 50 or 60Hz - I assume that makes it easier to export the same model to different parts of the world - then the only other internal change is the transformer.
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