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this sounds like tyre noise to me when you travel over different types of surface does the noise stop or change?
if it does then its tyre tread noise and you may need to have the tracking checked as these cars are prone to the adjusters seizing up so its often left which then results in tyre scrub and excess noise
this could be a worn drive shaft joint - typically these won't produce any vibration unless badly damaged but they can be noisy or 'clonk' for a long time beforehand, turn the steering to full lock and look at the drive-shaft rubber boot there should be no rips or tears in it and the suspension should be clean and dry of any grease. If you reverse at a reasonable speed with the steering on full lock a worn joint will 'click'.
the noise is road speed related so its nothing to do with the engine
if the tracking is out though swapping the tyre won't make any difference as the geometry of the suspension is set
does the car pull to one side or another when driving or seem a little 'wayward' when braking into a corner
can I ask what make and model of tyre you're running?
might be worth trying moving the tyres round so you have 1 make on 1 side ? and move the RH front tyre over from where you are now
I know this isn't recommended but just as an experiment it will show if tyre type is having any influences