This is the long hundredweight as opposed to the short hundredweight of 100 pounds as used in the United States.
From the en.wikipedia.org
Both the long ton and the short ton are composed of 20 hundredweight, being 112 and 100 pounds respectively.
From the en.wikipedia.org
In the United States, only the ounce, pound and short ton-known in the country simply as the ton-are commonly used, though the hundredweight is still used in agriculture and shipping.