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Switched off the water mains, then proceded to find the culprit, which was a little plastic nut, on the other side of the systern in the Loo, had split into three pieces, and let the full mains supply flood downwards into the room below. Funny thing is the toilet was replaced two months ago.
Cleaned up all the plaster, and lots of mopping, though i was intending to re-do or more to the point redecorate at some point the future, this certainly speeded up the decision.
My fun weekend!