BMW 320D - Excessive smoke on hard acceleration. The cause.

Recent posts have documented my concern regarding heavy smoke from the exhaust of my 2005 BMW320D under hard acceleration. After research it seemed it could have been resulting from a blocked crankcase filter but I was waiting for a long journey  before pronouncing on the results of replacing it. Well, I'm pleased to say it worked! It still smokes at times but only under very heavy acceleration. I was fortunate to be followed by a friend on my trip who confirmed the result. However, the turbo still whines!