If you call 999 for help, you'll be asked which service you require, be it police, ambulance, fire or coast guard, and your call may be ended if you don't answer - but a two digit code could help ...
We went behind the scenes at Northumbria Police's call centre ...
Officers are urging the public to call 999 if they see Sam Stewart, 35, who was last seen since March 2 - but have warned 'do ...