Thanks for this thread. My MY22 P4 just developed the what sounds like the same type of creak in the area of the bottom of the windscreen. I wrote a list of the fixes suggested in the thread above and started by driving with the drivers side rear bonnet latch undone (I wedged a cloth in the rear edge of the open bonnet) — this immediately fixed the noise. So I assume noise was due to the bonnet rubbing on the cord.

I tried lubricating the cord with some boot wax — which worked for about 10 mins. Then applied some silicon grease to the cord with my fingers - which seems to have done the job more permanently. see pic.

Thanks all for the various bits of advice!

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