I'll try to get along but may have to tender my apologies, may be on taxi detail that night.
FWIW, (and for those who may not have seen this mentioned elsewhere) based on information from Lyons, which supports a less specific claim made by P Claughton, I am confident that GR headgear originally came from Hazard Pit at Hetton Colliery, East Rainton. This being the case, it would appear that some of the structure, at least, could be 70+ years old.
When its gone, its gone.
I hope this is helpful
MARK