A white painted Zuckerman with a black band & FG to front & back. Originally called the Civilian Protective Helmet which cost 5 shillings & sixpence but are more commonly called the Zuckerman after it's inventor Solly Zuckerman.
The fire guard had been formed as an essential factor in the defence of this Country against the attempts of the enemy to destroy it's homes & industries & to win the war by fire. ( Fire Guards handbook)
A senior fire guard was in charge of about 75 fire guards consisting of teams of 3 with a stirrup pump, sandmats & buckets of water. In built up area's a team of 3 would cover 150 yards of street or 30 houses.
The helmet is dated 1941 as all so far seem to be, the liner is also, although I have seen 1940 dated liners.