According to the BMW official Pdf installation guide the part nubers listed for this kit are:
65 90 0 429 056
65 90 0 429 058
I don't know whether one is LH drive and the other RH drive or what, but dealer said the later one is listed at £521.00 retail

and the first no. isn't available. Don't know what the second one is either ( i.e. fitted / not fitted, LH / RH or just plain wrong ! )
Paul,
Any chance of clearing up when this kit will be available for UK market and which number is correct ?.
C.