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Sorry for the confusion, the bike and bb are only 6 months old and it's only really been ridden consistently since september so not very old. I was saying that I've had various bikes with bb30 over the past 4 years and have gotten away with no clicks or creaks, which is fairly lucky I think.
Probably worth greasing pedal threads again before I go to town on it. Also going to invest in a bigger range torque wrench, the 42nm figure seems to be pretty crucial according to some.
If your BB30 is doing that, then there is nothing to diagnose as such: it needs to be stripped down, cleaned and reassembled.
If it's four years old and you're taking it apart anyway, you might as well sling some new bearings in.