A Probabilistic Digital Twin of UK En Route Airspace for Training and Evaluating AI Agents for Air Traffic Control. - Nick Pepper; Adam Keane; Amy Hodgkin; Dewi Sid William Gould; Edward Henderson; Lynge Lauritsen; Christos Vlahos; George De Ath; Richard Everson; Richard Cannon; Alvaro Sierra Castro; John Korna; et al. (CoRR, 2026)