Back on topic....
I had an '05 Gti a few months back which sounded very clattery and diesel like on tickover, I was told it was normal but took it to my vw dealer and he found there was a problem with the timing chain housing and some other part that I can't remember!! all was replaced under extended warranty luckily as the work totalled over £1400
Get it checked out......
Thoughts on this anyone??......the diesel sound may not be "normal" then? 
Took mine to my local dealership and they agreed it didnt sound right, so its booked in for an investigation on wednesday. I'll be sure to let you know the outsome. I've got a feeling its going to be the fuel punp and/or timing chain!
What was the outcome Holepunch???
Hi Spencer30 I did het your PM but for some reason it wouldnt let me reply?

??
Anyway, the car went into the dealer on wednesday for 3 new monza II's but in they end they changed their mind and only replaced 2.
As for the rattle they decided it was the cam belt backing plate (never heard of it) but due a them not having the correct parts and then recieving the wrong ones its still with them.
I hopfully pick it up tomorrow lunch, I'll scan and post a copy of reciept so you can see exactly what has been replaced.
Fingers crossed it will sorted but I'm not holding my breath.