"The requirement has been written/amended in close partnership with the UK's Best Helicopter maker."
Not true in any way, shape or form. The requirements for BLUH and SCMR, and more recently BRH, were not drawn up in collusion with any manufacturer, even the one in the West Country. In fact, the BLUH requirement was drawn up precisely because a re-engined current Lynx couldn't meet the requirement in the first place (the LLEP and subsequently the LLUH programme).
The BRH requirement does not include carrying pax, other than maybe a couple in the back. The utility/lift elements that were in BLUH have been dropped from the requirement as part of FRC.
The Future Lynx airframe is a new design, not a 30 year old one. You may have noticed that it's a different shape, with new crashworthy structure making use of monolithic machined panels, rather than thousands of rivets. The internal volume is the same, true, which is a restriction if it's needed to carry more than 6 + a DG in the back in crashworthy seats, with kit.
BOWMAN is an essential requirement for BRH (as it was for BLUH). IDM is essential as well, to talk to WAH64. If Future Lynx is chosen, then it will have BOWMAN and IDM capability.
Current Lynx OSDs are 2012 for the 3, 7 and 9; 2014 for the 8, BTW, not 2010.