Hi mollydog
My first thoughts were that they hadnt tensioned the chain properly. But they should have picked this up when they carried out the mot. My chain has a link but even so i dont touch that for simply removing the wheel. I was thinking other than a catastrophic chain failure (very coincidental ) and again any chain that looked in poor condition would surely have failed or at least flagged up an advisory during the test.if the op confirms the chain is in one piece still, then as you said it must have jumped the sprockets.
Bill
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