I should add that I have had the bonnet open with engine running and engine hot and have never heard the really loud whistle. I am certain it would be audible even with the engine on. I doubt this has any link to it but you never know - it had a problem with the glow plug control unit so they were not coming on to pre-heat on cold starts and were coming on (to overheat) whilst driving. A new one was fitted and all is back to normal. I have never heard a car whistle whilst off so something must be on. I hope the battery isn't being discharged!
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