The latest EC135 crash in Strathclyde reported that the passengers in the back would have been much less likely to have suffered their injuries if atleast a four point harness had been fitted rather than the standard diagonal (car) seat restraint.
We have gone further and fitted the anti submarine seat restraint (5 point). For what it's worth.
A simple lap strap, in my humble opinion, is a complete waste of time. Think of all that flailing around and glancing blows to the a/c structure etc

Then you add to this, people flying in one of these mickey mouse harnesses with little or no head gear on
No thank you!
Any helos out there yet with air bags as standard?