LBL, I'm not going for the easy joke , else Toddy will scorn me....this after all a family forum
Oh...and do you have my licence to use the word 'tranche'?
Funnily enough, looking at your definition I had no idea it has a financial services dimension. People will assume that I am a bbbbbanker and then the hit squad will certainly come out for me! Anyway.....and wrongly assuming that I am some sort of rich, city-slicker....I have always used the word tranche in this context http://www.bbr.com/fine-wine/en-primeur-overview