Thanks for the replies gents which confirm my thoughts - I was just wondering!
I can see how it would add to/create higher temperatures so that's not a great idea and the car isn't noisy so there doesn't seem any point.
Car already has dynamat in selected places inside the car under the carpet (previous owner) and I've used that in other cars and fund it beneficial, but looks like I'll be leaving the bonnet well alone - thanks.
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