I would have a look, but i'm not too sure how to describe where the noise is coming from because my technical knowledge means i could only say it's 'coming from the front of the engine!'.
It does sound like a sewing machine kind of ticking though, and the car has done 130,000 miles.
I think i'm just starting to notice little things, and come to the conclusion something is wrong because of the luck i'm having at the moment.
Thanks for all the help, i'll keep you up to date if the engine blows up or something.