I'm sure there will be examples and my childhood memories won't be great but that link isn't a good example of British recipes.
Most of the instances of "cups" come from the "Edwardian recipes" which is a collection of international recipes including American. It includes in the preface a Table of Measures which is what you do for Brits who see "cup" and ask "what the fuck is that?"!
British recipes today largely use metric units. Pre-metric recipes absolutely did use cups (although this persisted in Canada and the US more than the UK). As Glen points out none of these British cups were standardized.
Most of the instances of "cups" come from the "Edwardian recipes" which is a collection of international recipes including American. It includes in the preface a Table of Measures which is what you do for Brits who see "cup" and ask "what the fuck is that?"!
4 cups flour = 1 quart or 1 lb.
2 cups of butter (solid) = 1 lb.
2¹⁄₂ cups powdered sugar = 1 lb.
1 cup = ¹⁄₂ pint
1 glass = ¹⁄₂ pint
1 pint milk or water = 1 lb.
9 large eggs = 1 lb.
1 table-spoon butter = 1 oz.
1 heaping table-spoon butter = 2 ozs.
Butter the size of an egg = 2 ozs.
https://www.gutenberg.org/files/68137/68137-h/68137-h.htm#Li...