Given that your concerns are the reduction in healthcare provision may I interject amongst you revered pilots and offer some healthcare input about your predicament?
The NHS is in a dreadful situation. Standards are about the lowest in the developed world when you look at outcome, although there is massive spin and smoking mirrors. Units are being closed around the UK and fighting this has to be based on statutory requirements.
IMHO there is no mileage in fighting the closure of neonatal or obstetric units. Labour is not an emergency and there is no requirement to get a labouring woman into hospital in a set time. There is scant evidence giving birth at home is more dangerous. Likewise there is no requirement for a close by neonatal unit, and neonates are commonly moved hundreds of miles because local units are frequently full. It is the norm.
Your A and E is presumably going to be open in the day so that will have no effect. If it is closed at night it will have no effect on patients already in hospital, only patients with emergencies who will then have to travel further for care. The question is whether that extra distance will cause a level of harm to enough patients to justify challenging the closure, especially when failing to partially close A and E might result in other closures which themselves effect outcome.
Sadly helicopters are not part of NHS requirements in England and Wales. They are a voluntary service an NHS Trust may avail itself of, but if it doesnt exist the Board of the Trust cannot be held to account. In reality if you have a heart attack in the middle of a snowstorm in a high rise flat in the centre of a city and weigh £280kg a helicopter is of no use anyway.
You therefore need to gather evidence about land ambulances as the NHS Trusts are mandated to provide these to a certain level in a certain time. Can the ambulance service meet the time constraints? Can patients be delivered to the more distant facility in an acceptable time? Can that facility cope with the increased demand?
Healthcare professionals will often say no. Managers always say yes. Saying no but we will cope by using HEMS is very dangerous not only because of the limitations you have identified, but also because it may not exist if the money dries up.