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I had Hankook on front and Michelin Pilot 4 on rear, which were pretty good with road noise, I then got a set with Bridgestone Turanza on rear and Perelli P7 on front (didn't choose them came with alloys) I think they sound noticably louder. All run flat and on 18"s. I would look at noise rating for the tyres when you change. Try having a look at tyre settings in the car TPMS, I think mine is set to "comfort" I think it just means less pressure than "Eco" mode, so I I would assume they would be a bit quieter and softer for the what apparently my local council have the nerve to call roads.

Good news, BMW have agreed to fit the potential fault part. Thanks for everyone's advice. Great site Regards

Morning John Welcome to the Forum First the obvious have you tried nipping up the nut ? If you have tried that and the leak remains then I would check the "O" ring for damage also the Nut and Housing. Green colour "O" rings are normally Viton material so I would check www.realoem.com if you haven't already? Put the last 7 digits of your Vin into the search box and it will call up your model then check the Steering section. There should be a Part Number on your receipt from the Dealer that you can check against realoem that will confirm if it is correct I hope this helps Dave