Strange noise on start up

[T0m]

...hi guys, Ive noticed over the past week Ive got this strange noise coming from my engine when I start the car up, it only happens when the car is cold and it sounds like a small crunching noise. It only happens for a short second then disappears the car drives ok and there are no other problems with it just thought Id see if anyone on here has also had this issue before?

Thanks

Tom