It's fixed! Auxiliary/drive belt was fucked! So I've followed the guide and swapped it for a new one and surprise the noise has gone! £19 Now to sort a track day or 2 before Xmas...
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What's annoying is that I bought the car from an Arnold Clark in May and they supposedly changed the cambelt.. why on earth would they not change this as well?? The rubber was perished all over. Makes me dubious about the cambelt now.. I was already annoyed at the state of the discs.. think I might have to contact them to complain.