I eventually sorted the droning noise from the rear of my car....turned out it WAS the right rear wheel bearing. £40 and now sounds great. Such a good mechanic so I had him do some MOT advice work and rebuilt front right suspension (wishbone, drop link rod and track rod) for £120.
BTW not been around for a bit as I have been browsing the convertible section on bimmerforum. This is quite good to tap into for 'vert specific issues but not always heavily populated.

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If you don't like the way I'm driving...get off the pavement.