I used to be a Volunteer Rural Firefighter a few years ago so when I saw this RNZE fire helmet for sale in a local Army surplus shop I had to have it.
Is a N660C Metro helmet made by Cairns & Brothers. Body material is composite fiberglass and the neck/ear protector is Nomex.
The two red ring markings indicate that the original owner was a fireman, Lance Corporal.With the visor up. Back.The inside showing the adjustable liner.