Clean and grease the axle, check for play in the BB, check pedal bearings, tighten up saddle bolt... and then discover that the source of the creaking is a crack in your seat tube, as has just happened to me. Poo.
@Richard_Cheese started
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Clean and grease the axle, check for play in the BB, check pedal bearings, tighten up saddle bolt... and then discover that the source of the creaking is a crack in your seat tube, as has just happened to me. Poo.