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@roadwarrior
I deal with this alot at work.
The problem is manufacturing discrepancies, i.e sometimes the BB shells are slightly oversized. This creates play in the BB interface that can lead to creaking and ultimately premature wearing of the bearings. You can fit the bearings with a loctite bearing retaining compound to take up the slack (this is FSA's official line) it seems to have worked on bikes we have serviced. If that fails to cure it, then it should be a frame replacement under warranty.
Also, re. the british weather comment, you only have the bearing seal itself to hold back the water, which is not ideal. Plus more can work it's way through the seatpost clamp. Wheels manufacturing make a set of better quality bearings with better seals than FSA.