Saddle rails loose in seat clamp

sorry for the hijack, but my seatpost (or seat) dont know which one just started creaking as i go over bumps. it only happened last night, and i cant figure out what is causing it. i have a brooks on so i dont think its anything to do witht he saddle so im guessing seatpost? can anyone help? cheers.

have you tried putting a condom over the seat post before inserting into the seat tube, this will stop that noise & keep moister out.