Got the most annoying creek on Yeti 575 when applying force through pedalling,usually on climbs. It sounds very muxh like the bottom bracket typy of creek but this is brand new and was the same with old one. I have checked tightness of pedals, cranks, b/b and can now only think its the bearrings/pivot above b/b. Cheers for any advice…

are you sat down or stood up on the pedals when it creeks ?

Chainring bolts.

They can, but it could be any number of things. I once traced a creak on a mates bike to a cable end rubbing in the frame as the suspension cycled.

No, rivers creek. Bikes creak.
HTH