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@snottyotter
Sometimes if you have the bike on the floor, stand to the side and lean it away from you, put a load of force through the pedal at the bottom of it's stroke, will probably need to hold a brake on, that will flex the frame a bit but the BB will probably click if there's something wrong with it, go round the other side of the bike and repeat, back again and see if you can narrow down the problem with the sound.