If the roads are suitable for the ambulance station, then move the ambulance station - don't change all the roads to fit in with a more movable service. I'm still not sure why they don't move the ambulances into the fire station on Stanstead Road rather than using a small back street.
Not that I'm in favour of changing the one way system. I remember what the queue was like on David's Road before the no entry sign. In fact I think I remember it when cars could go both ways on David's Road (rather slowly as they weaved past each other). Can anybody confirm if this is a real memory?