One third is already there ...
Sorry NRDK, but that is naive fantasy. A year from now, it might reach around 25%.
One base is part-time, only one does mountain, there is no low light requirement and therefore no NVG except as a rear-crew search aid, the comms requirement and therefore fit is inadequate, and the aircraft at two bases are not suitable. No matter what experience and effort the crews bring to this service, they remain held back by the current contract and by DfT/MCA lack of vision.
My hope is that in the future the lid is not going to be held down on a boiling pot of diverse talent. Fortunately, it appears that the current path is ever upwards.