Secret filming reveals how ambulance services are managing soaring demand by sometimes restricting vehicles from all but the most critical cases. Under the ‘no-send’ policy, patients can be left waiting for hours - or told to travel to hospital themselves. Warning: Contains some distressing content STREAM: ‘999 Undercover: NHS in Crisis: Dispatches’ on @Channel 4. #Ambulance #999call #EmergencyServices #Documentary #Dispatches