DMRH (Mk3a) were, and are, due to enter service with BERP IV.
Its actually a big difference when compared to seeing/hearing a Mk1/Mk3. Alot quieter.
I do not believe they are being placed on the Lynx. They're staying with BERP III.
The Carson blades have been in regular service with Carson SK61 for a few years- and I believe that the idea for them on RAF and RN Sea Kings a while ago was turned down- and have proved useful in logging etc.