zero1,
Lynx is to small for most roles and has only been of limited use. Merlin is bloody big but without the capacity of CH-47. Puma has proven to be of a very useful size for most Ops.
Ask the boys on the ground what they want and they will tell you CH-47. Its fast, can carry all the lads in one hit, and is able to operate everywhere, unlike other helis we have. Failing that the NH90 will be a good option size wise.
Perhaps a good introduction of NH90 will lead to a bigger buy to replace Puma?
Wokkamate - you doubt the experience of the Puma in the SF role?