Ambulance crews to treat over 1,000 patients in Exercise Unified Response Posted on 29/02/2016 NARU»News Wire»Ambulance Trusts»London Ambulance Service»Ambulance crews to treat over 1,000 patients in Exercise Unified Response London Ambulance Service will treat over 1,000 casualties during Europe’s largest disaster training exercise which begins in the capital today (Monday 29 February).