If you're going to have a heart attack a petrol station forecourt might be as good a place as any.

Z Energy is installing more than 200 defibrillators at service stations across the country.

The company says it's a no-brainer, as defibrillators significantly improve the chance of someone surviving a cardiac arrest.

It says while there's quite a cost, the machines only need to save one life to make it worthwhile.