The most critically injured patients in rural areas are at risk due to the time it takes the ambulance service to reach them, a BBC investigation has found.
Some rural communities wait more than 20 minutes on average for 999 crews or trained members of the community to get to immediately life-threatening cases like cardiac arrests and stab victims.
A response should come in six to eight minutes, depending on where you live.
Experts said delays could make the difference between life and death.
This was particularly the case for cardiac arrests where "every second counts", the British Heart Foundation (BHF) said.