Umm, excuse my ignorance, but wouldn't a seat belt stop that happening ?
A number of two door cars from years ago had no catch at all in the mechanism ?
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Unfortunately I am wrong. ADR 22 (22.1.1) Specifies Head Restraint - A device either mounted on or integral with the seat back. Its function is to minimize rearward movement of the head.
However even in the Third Edition of the ADR 22/00 only required head restraints to be fitted to the front outboard seating positions.
Not my call, that is something for the legislators and engineers to decide.
All I know is that under ADR 3
<snip>
3.2.3.0. Except far a `Seat' having a back that is adjustable only for the comfort of its occupants hinged or folding `Seats' or 'Seat' backs shall be equipped with a self-locking device for restraining the hinged or folding `Seat' or 'Seat' back and a release control for releasing that restraining device to preclude the possibility of impact forces acting on unrestrained hinged or folding 'Seats' or 'Seat' backs.
You will also find that the cars like the mini - which didn't have catches would have been manufactured prior to January 1977.
Guys
Thanks very much for all the suggestions. Will visit Trimmer and see if we can install headrests permanently to the rear bulkhead, still allowing seat st to fold forward. I modified the existing brackets and secured with removable bolt.
Regards:)
Rover