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Sounds to me like electrical interference coming from your alternator, its quite common particularly on older cars. Not heard of it on the Laguna II though.
What you will probably need to do is get a noise supressor fitted, not sure where though. But a good ICE company will be able to advise and do this for you.
Hope this helps.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo