Prediction markets moved the median implied Starmer resignation announcement from 12 Sept 2026 to 13 Sept 2026.
The shift of 1.6 days reflects the aggregated median across live Polymarket date markets — not a single poll or briefing. When several windows reprice together, the implied announcement date moves sharply.
For live odds, trades, news, and the full rebellion breakdown, see the main tracker at starmer.boo.