My exhaust has moved :/ I can wiggle the exhaust from the tip, does this just mean one of my clamps has gone ?

Sounds like a yes to me, something has come off/snapped. Time to get your back dirty and investigate.

Could also be a hanger come off

got it sorted, the clamp between the front and centre part of the exhaust was loose due to rust ! got a new part for a tenner, easy fix !