I had my x6 gearbox serviced by these guys https://austrin-engineering.co.uk/, they are based in Tyne and Wear so might not be suitable for all but I would certainly recommend them.
Box has never been better, but the oil has never been changed from new, it now has 57000 miles under its belt
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Gearbox Service
Gearbox Service
I've had mine done there twice, at 73k and recently at 106k. I don't hesitate to recommend them either.
October 2012 build X3 30d SE, Bluewater. Now with Webasto sunroof and paddle-shift 
