Bottom bracket shell problems help please

^ Hang on a mo' what I've said IS true, you've just said the exact same thing but the other way round - read what you quoted from me: "face if the BB is not a sealed cartridge type" is the same as what you're saying: "you need to face a b/b shell is when installing the "new type" (Hollowtech II) external bearing cups"! In actual fact you are 'wrong' because strictly speaking you should ALSO face when using any type of BB where the two bearings are not physically joined together which includes the fancy/traditional NJS type like Sugino 75s etc. with separate races ;-)
p.s. 'sealed cartridge type' means any BB where the two races are joined in one piece, like the Miche, Shimano UN series, modern square taper Campag etc.

Can we just check what is meant by sealed cartridge unit. To me, sealed and cartridge is talking about bearings that are sealed within a cartridge, like these..

http://www.treefortbikes.com/349_333222341758__6902-Sealed-Cartridge-Bearing.html

As found in Shimano and all current campy, FSA etc external cups.

You are saying the B/B shell should be faced when installing older "traditional type B/B's. I feel their is no need, because the bearings are located within the shell, therefore they are square to the Right hand cup and the left hand cup is either wound in to meet the drive side and flange-less, or has a lockring and sets the bearing preload.

The reason i feel facing is necessary on the modern external cups, is that the bearings are being in effect sandwiched between the crank and the B/B shell. If the shell is not square, it will cause the bearing to wear, as if there were a tight spot.