Hi Dazza could be the alternator pulley mine went and made a similar noise to what's yours is
Is it the same noise as mine?http://www.mk5golfgti.co.uk/forum/index.php/topic,104412.msg1017006.html#msg1017006AKS are going to try some of their magic spray on the starter motor in a couple of weeks so I'll do an update then.
Update - The expensive grease spray Alex used cured the squeak and it is much easier on the ears now.