TC - don't tar us all with the same brush - you are clearly ex-Navy where the attitudes you describe still prevail. The same us and them views are also often seen in RAF fast jet squadrons but not on RAF helicopter units.
The SH force spends most of it's time on deployment (sometimes on ships) and the working relationship between pilots, rearcrew and engineers must be good for the sqn to function.
On an RAF SAR flight 99% of the aircrew and groundcrew will be on first name terms (not just a one way street as others like to use it) and many will socialise together.
There will always be a few individuals (aircrew and groundcrew) who have a deep rooted distrust in each other but that is usually down to personalities not accepted working practises or ethos.
Our CRM is as good as any and better than most, I have done the courses and for the most part they are about common sense and giving respect to the other members of the team.
Whenever the aircraft are in pieces (often with the Sea King) you will find aircrew in the hangar poking their noses in and asking questions - apart from any CRM issues it's a very good way of learning more about the aircraft you fly.
You should have done an exchange tour with the crabs TC - we've got a 771 pilot just joined us so I hope he will learn how to relate to non-officers properly.