NHS bosses and the most senior doctors and nurses have united to deliver a hard-hitting message to the public as health services across Hertfordshire and west Essex experience extreme pressures. As well as the accident and emergency (A&E) departments at Princess Alexandra Hospital in Harlow, Lister Hospital in Stevenage and Watford General, the East of England Ambulance Service, GP practices and community health services are all being stretched by the number of people calling on them for help. The public are being told that ambulances should only be requested in genuine emergencies and that an…