Civilian Protective Helmet

[tinlid]

A standard grey painted CPH with in white a triangle front & back any idea's? The name G. Richmond, 98 Ena Avenue. RMDS1661 are scratched on the inside brim, I think this is in Nottingham.
Shell is dated 5 41 VM, could be Vauxhall Motors as they made 750,000 helmets during the war & I don't think any of them were Mk2's. The liner was made by FH? have seen this maker a few times on these & Mk2 liners, but it's a nice early one 1940.
So now we have the shells dated 1940 plus the liners, are there any liners out there dated 1942?
Aaron