For anyone that is interested, my X5 still hasn't been repaired. I've been told the parts have been ordered but BMW have no way of knowing when the parts will arrive. COME ON BMW, 4 weeks so waiting for parts to arrive for a current model car (e70) isn't good enough. They don't even know whether the parts have been sent.
I doubt my next car will be a BMW, and when it's time to update my wife's e90 we'll be looking elsewhere.

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Current BMW's
2010 e70 X5 M Sport 40d Space Grey
2010 e93 320d M Sport Convertible White

Past BMW's
2006 e60 530i M Sport Carbon Black
2005 e46 325i Coupe M Sport Grey