Cast iron wheel by Slingsby of Bradford, found last year whilst out with @mudlark_mud_god.
In 1893 Harry Crowther Slingsby, part of a family firm of wholesale bottlers, established in Bradford, began to look into the invention of labour saving devices for the company.
Recognising that working practices in the local factories relied heavily on manual hauling, using gravity and lifts for floor to floor movement, he set about solving the problem of moving items horizontally around large buildings, creating robust trucks and trolleys to move heavy loads with relative ease.
The present day Slingsby workshop, with members of the family still on the board of trustees, tells me that Slingsby had their own foundry for casting wheels from 1893 until 1980.
This wheel most likely came from Bradford, went down to their workshop in London, and used as a trolley or cart wheel. Below, the photos show what the wheel was like when I found it, after I’d cleaned it up, and some examples of what the wheel might have been used for.
Sources: Slingsby workshop, Graces Guide to British Industrial History.
OLD FATHER THAMES | Tide Travelling Mudlark 
Hello there
My grandparents and my mother were friends with Mr Victor Slingsby and his wife.
Would anyone be so kind as to write me who now runs the company?
Wishing you all the best,
Denis
Hi Denis, Apologies for taking so long to reply, it’s good to know that people are reading this website and that it’s not solely about social media (where I spend most of my time replying to questions, much more quickly!) How fascinating that your grandparents and mother were friends with Mr Victor Slingsby. I did a little digging, and it appears that some Slingsby family members are still on the Board, one of them is Dominic Slingsby, who is also the Executive Chairman. You might also like to have a read of this page at the invaluable Graces Guides for historical information. Thank you for getting in touch! Marie aka Old Father Thames.