I don't class a diesel sound as rattly, it is a propper rattle not a diesel noise.
When I open the bonnet and listen close the sound does sound like it's coming from the top of the engine which is what made me think it was a tappety noise coming from the head.
I know nothing about cars which is why I ask here and I appreciate your replies.
If I stick my toe down it gets louder and for some reason it is very loud in 1st and 2ng gear just at the point where my foot is about to leave the accelerator pedal.
I plan on taking it down to Alfa but can't get down there until the weekend, I just hope it doesn't completely die on me for the next 2 days getting to and from work, luckily Alfa is only round the corner from me in Farlington.
Ill try and record the sound tomorrow in the day and ill post it up on youtube and post it here if thats ok and maybe then it will be more clear what it could be rather than my dodgy descriptions.
Thanks guys, I appreciate it.