And The Culprit Was...

Danny the plumber arrived at 9:15 and was done by 10:30. He had to take the toilet off to get at the obstruction. We can't use the thing for 24 hours so the sealant can cure.
And the culprit was half of a hot pink plastic easter egg.
ANd the moral of the story is:
Always look before you flush.

GHR