London preview

United Kingdom

Dial 999 if you are encountering an emergency requiring immediate assistance. You will reach the main switchboard for police, fire, and emergency medical services. 999 is the only number you need to dial in an emergency. The first thing the 999 operator will ask is 'which service?' If you are unsure as to the service you need or need more than one service (in the case of a road accident, for example), tell the operator immediately. While the operator can locate where you are calling from, even if you're calling from a mobile phone, it's a good idea to tell them your location. The operator will then connect you to the fire, police, ambulance service or the coast guards who…