Skyhigh-Ulster,
The PSNI helicopter has carried out a few casualty evacuations over the last few years, and while this it is not its primary role they can exercise discretion for the purpose of saving life.
I understand that the PSNI are considering a second larger helicopter for use in the future but this will again undoubtedly be for a Police role, and as such they will no doubt look at all options, and pick the one best suited to the role it has to fulfill, i.e. Police Air Support.
On a separate note, I also heard recently that the NI based charity which are fundrasing for an NI air ambulance, and have been for several years, hope to have the required funds to get the project up and running next year. I wish them the best of luck with it.
BC