On the 1921 census people who were unemployed were asked to put their last occupation and place of work and underneath write 'unemployed'.
In the 1921 census I found a cousin of my grandmother, George Milner. He was an engineering blacksmith who had served his apprenticeship at the Woolwich Arsenal and moved to Sheffield by 1909. In 1921 he was "Temporary out of work" from Vickers Ltd. (Engineers), River Don Works, Sheffield. This was a huge company, which still exists as part of Sheffield Forgemasters. Most of the works must have been involved in war production when 16,000 people were employed there. Amongst many other items they had the capacity to make the longest gun barrels available. At the end of the war government contracts would have dried up very quickly.