This is really a tough one. I think I should give the answwer and hand over to you Jon for all your efforts. This is known as the Derrick Block. Over to you.
Hi John
I still can’t find the Derrick block even though I know what it is...all I can find is a Derrick lifting block which, naturally, is the block that lifts the Derrick when loading cargo....
Morning Tim.
You're right.
It's a Zuckerman helmet.Designed for the various civil defence groups in the UK in 1940. This one has FG stencilled on the front for Fire Guard.
It's taller than the military helmet to create a sort of crumple zone as it's designed to protect against falling masonry etc.rather than to give any ballistic protection.
Jon.
I've seen other Allards, so this looked familiar. A Google search produced the model. Could someone else take my go? - just back exhausted from Granddad duty.