This has been a problem in Cornwall for many years ever since they transferred control from locally to Exeter I think about 15 yrs ago, Exeter was over 100 miles from where I lived and it was a regular issue, I am surprised its not been resolved but then the Air ambulance does a magnificent service in Cornwall and perhaps covers the failings of the road ambulance service.
Moto G5s Plus, Sygic 17.4.8