I can officially confirm (like a few other members) that the BMC kit, and the filtered oil crankcase breather pipe, will pass an MOT with no trouble whatsoever - took mine to VW today to have the car tested and of course it passed with flying colours
I also passed with a small chip in the windscreen that is just a couple of centimetres below my (the driver's) line of sight, but smaller than a 5p peice in diameter. There are no cracks spidering out from it and it's been there for several months

I just haven't gotten round to getting it fixed!
That is all!