Just as I was finally getting the sodding Jamis dialled in, it develops a new sound

Seat finally right.
Gears finally working (how hard is it to get gears working? Pah, just flamin' ask me )
Bars in the right spot ... sort of, as close as you can get with a threadless headset and the appalling lack of choice with necks the industry provides.
Hell, I'd even managed to get the stupid brifters in a non-lethal position ... finally.

After 1,300 km, I actually had this stupid bike WORKING FOR ME!

So it starts to click.

Just the occasional annoying click at first.
Then more often.

Where's it coming from? Is it while pedalling or all the time? Hard to tell ... at first.

That rotten click got louder and more requent. Dammit, this bike used to be the Stealth Fighter it was so silent, now dogs leap out of the way and small children bury their faces in Mummy's skirts in horror!

Almost.

Actually, I am being a wee bit dramatic, but not with the facts dammit This bike HAS been that hard to get right, but it seems to be almost there. So why is it picking on me with this metallic clicking noise?

The noise is reasonably loud, loud enough to be really annoying.
It's a metallic clicking sound.

It's intermittant ... naturally, if it did it all the time I might be able to diagnose it. However, it has progressed from once in a blue mood to once in a crank revolution to twice in a crank revolution - it's getting worse so part of me is waiting for something to break as that's always a sure sign of the cause.

It doesn't happen when I'm coasting - it's finally occuring often enough to confirm that.
It continues to happen when I'm standing and pedalling so it's not the new Brooks saddle that's just reached that time when you'd expect it to make strange noises.
I'm using toe clips and there appears to be no movement in the clips (I'd hoped that one of them had worked loose but sadly no) nor does there appear to be any problem with the pedal bearings - M324s with about 3,500km on them. Bearings?
The gears have just been adjusted and are finally working perfectly ... getting the outer cable length right fixed the shifting problems ... oh hang, that was the previous drama. But yeah, it's not the adjustment.

The bits are a mxed bag of old and new and worn in.
The chain is about 600km old and has one of them new fangled magic master link thingies ... which appears to be closed correctly (Wipperman chain and master link) and doesn't appear to have any tight spots.
The bottom bracket feels solid and spins freely - it has about 3,500 kms on it which is 'worn' but surely not 'ancient'.
The headset has no movement in it and is 1,300 km old ... but being a stupid threadless system that's suffered many 'adjustments' as I've tried to get the neck and bars right, there's always the chance that I've set it wrong at some point and stuffed up a bearing. However, it feels good at the moment.

The wheels all feel smooth and sound - Ultegra hubs with only 1,300km on them ... but as stated earlier, this noise happens under power. The wheels are tight and true.

The magnet is not hitting the speed sensor (first thing I checked) and there's no flex in the front wheel so I'm pretty sure it's not that ... besides, this only happens when pedalling, whether I'm applying power or just turning the cranks which probably rules out something warping under load.

No, the loose end of the front dr cable does NOT hit the pedal on the way through.

The bike is dead quiet when spinning the pedals on a workshop stand, even with the brakes dragging to give some load.

Dammit! What do I look at next?

Metallic clicking noise.
Only there when pedalling, standing or seated (so it's not the Brooks 'new saddle creak' or something weird with the new seat post).
Definitely NOT there when coasting.
It's getting worse and is quite loud - currently as frequent as two clicks per pedal revolution and getting worse ... when it happens.
It's come up and gone from 'what was that' to the current frequency in less than 160km of riding - I'm currently using her to commute with a 22km each way commute so this hasn't happened in one ride.

Any thoughts? Short of waiting for something to break, I'm out of ideas.

Richard
yes, I'm as pissed off as I probably sound