I need help locating a creaking sound, it is only there when the engine gets up to temperature. It sounds like it is coming from the transmission / engine bay when listening from inside the car. It shows up when setting off from the traffic lights and changing gear, it can be also heard if you rock the car in gear, have checked the heat shields around the exhaust down pipe, and all seem fine.
Are there any known problems with cracks in up pipe/down pipe?

Car is a MY99 UK Turbo.

 

This must be a difficult one