Thanks for your response.
There's no noise when in neutral. I've revved the engine to 3000 revs and all ok. Noise starts at about 10mph. Appears to come from osf. I looked, as far as poss under the car but cant see anything amiss.
Radiator header tank was low which is unusual even in hot weather. Excuse me if this sounds stupid but is it the water pump, although temp gauge was normal?
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