Clack, clack, clack at Cadence on Argon 18 E117 TT bike

This is starting to bug me now. My Argon 18 E117 TT bike is silent at lower cadences on the trainer but at cadences of 105rpm + its always made a rhythmic clack, clack, clack. Its started do it at circa 90rpm+ though. Any ideas?
I replaced the left cleat at the start of the season perhaps I should replace the right cleat and see how I get on :thinking:

Edit - Cleat replaced: I’ll see if that was the issue tonight. The rubber bits seem good and you can still easily read xpedo but the hard plastic looks worn in places.