Did I miss the blowout thread?
I guess so. It was hidden in This Update
Michelin agreed to let me take it to a local dealer rather than return it to Camskill. Local Kwik Fit reckon it took them 45mins to get it off the rim. The bead has snapped, but they can't tell if that is the cause of the issue, or damage caused by it flailing around. It will go back to Michelin next week for more expert analysis.