Lack of resources are being blamed for St John's move to pull some ambulances off the road. 

The service is aiming to rein in costs for when a worker is sick or goes on leave. 

Health commentator Ian Powell told Mike Hosking that it comes down to having enough staff, and funding isn't matching the increase in health demand. 

He says this is not just a St John's problem there's a problem in the model, and there's a problem tangled up in the generalised under-funding of our health system. 

LISTEN ABOVE 

• Ambulance Association warns St John's cost-cutting puts lives at risk