Ah, my pet topic.
Since cheaper operations would lead to more air ambulances, and I'm not aware of too many single-engine aircraft raining down on the heads of cty-dwellers... I'm a keep proponent of single-engine EMS and a relaxation of the single-engine restrictions. It would save lives.
I've flown the heli-lanes over London and had to take avoiding action. All the other single-engine aircraft are clustered into those narrow (and winding) lanes. Surely the collision risk is far greater than the safety benefits of only allowing twins to fly in straight lines over the city?
Benet