https://www.reddit.com/r/typewriters/comments/1xly6lg/ribbon_comparison_uk/

https://www.kores.com/product/ribbons/<br /> Kores manufactures typewriter ribbons and cassettes out of Europe:<br /> Leopold Ungar Platz 2/ Office 334<br /> 1190 Vienna, Austria

They sell on Amazon in the UK. https://www.amazon.co.uk/s?k=kores+typewriter+ribbon

See also: https://www.reddit.com/r/typewriters/comments/1x5gurr/a_company_founded_in_1912_is_still_selling_silk/