It's weird because the belt was changed about 45k ago.
Thinking back over the past six weeks, I felt a very slight vibration when the car was on tick over or netrual which I mentioned to the wife and she said "oh you're being paranoid about your baby again!". I actually think that was the start of the pulley working its way lose!
It's bugging me how this could happen
I've only had the car 3 months and nothing was picked up when it went in for service a few weeks back.
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2002 S8 - Irish Green Pearl. Cat N (saved by the D2 Doctor

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1988 E30 Coupe - Royalblau Metallic
2003 S4 Avant - Light Silver Mettalic
2016 S5 Coupe Black Edition - Glacier White