knock when changing gear with a cold engine

I have a knock coming from underneath the car when I change gears in the cold

Hey Scotty, I have a 2005 Peugeot 307 5 speed manual petrol and when I change gear before the car has warmed up I get a knocking noise from under the car. It only happens when I change gear when the engine is cold, when the engine warms up the noise goes away. Sorry about the blower noise in the video, I forgot to turn it off before recording.