Stanley Spencer spent a lot of time in Port Glasgow during WWII when he was commissioned to paint scenes in the local shipyards showing the workers' contribution to the war effort. These are no idealised representations, but honest, down to earth views of the shipyard workers going about their tasks.
The final paragraph on the tribute reads -
These panels have been commissioned to celebrate the life and works of the Wartime Artist Sir Stanley Spencer CBE.
The steel plates represent both the work of the Artist and the Ship Building Industry of Port Glasgow. Their shapes take inspiration from one of Spencer's most significant works entitled 'Burners' painted in 1940. It depicts Ship Workers 'burning' or cutting steel plates before they are rivetted together.
You can view that painting here.