Welcome to the forum Craig, you'll find the members on here are a friendly and helpful bunch :)
You can recover early history for your a4 from Audi as they should have ball the servicing info and work carried out whilst under warranty.
It sounds like the clutch could be on it's way out, what miles is the car on?
Oh and if you're unsure on when the car was last serviced then it might be worth you getting a major service carried out. The 1.9tdi engine is a pretty tough engine and it has a cambelt.
Where is the bubbling on the paint?
Cheers
Steve