Why does the AAC need an SH capability? Now they have AH, let them keep that specialised role and leave SH to the RAF/RN.
There is no need for a light obs/recce helicopter - it would never have as good capability as the AH -D model and UAVs fill the role much cheaper than a Kiowa or similar variant.
Maybe the 3-5 Bn that the MoD will have to pay for SAR H would be better spent sorting out medium lift helis for SH and SAR.
Lynx should be buried for ever - it is not the engines that are no good, it is simply a factor of the cabin being too small for the job.