Creaking front end

On last week's audax a creak started developing at the front end of my new S40.

Last night I took a look at it an nipped up the handlebar clamp, boom clamp and chainstay clamp (that one was quite loose). I'm assuming that was just stuff moving/settling in after the first 500km.

Today on a quick 50km it was still creaking at the front end.

It's not a pedal/cleat - that's a different squeal, and there is no sideways play in the BB

Any ideas
 
My front end creaks on and off and has done for 4 years, I have heard that lubing the boom and re-clamping can help but have yet to get around to it.
 
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