Block Lad?

[badpenny]

During the course of my family history research i have come across a record for my Grandfather where his occupation is described as a 'Block Lad'

in a wireworks.

Any thoughts on what a 'Block Lad' might have been?

thank you..

 

[jukebox]

Have a look at https://www.bbc.co.uk/history/ww2peopleswar/stories/73/a3873873.shtml

 

[badpenny]

Thanks for the link, much appreciated...