I asked the CAA PLD for a list of authorised CAA approved multi pilot Helicopters in the MOD. The answer was the FBH AW139 as it's the only helo with a multi pilot IFR RTS and RFM! All other mil types are "IFR- single pilot from the right hand seat with a suitably trained aircrew member in the left hand seat" as listed in the types RTS by the RTSA.
If you now take that info to 'LASORs, Sect D, App H, Pg 69, The QSP (H) flow diagram' you cannot finish the bottom line 'flow' to get the ATPL(H) in service but, you will have to find a civvy MP type to get your TR and IRT then get the ATPL(H). At the bottom of the QSP (A) Flow chart they have listed all the Mil types that are deemed multi pilot.
They still haven't furnished me with a list of civilian multi-pilot airframes to conduct the ATPL licensing skills test.
The frustrating thing is that UK civvy companies operate Single Pilot IFR helos under a Ops Inspector letter of agreement that they do it 2 Pilot (for licensing purposes)!!