https://en.numista.com/catalogue/pieces5002.html
According to the page for these coins and under the title 'Mints', these are listed:
Royal Mint (Tower Hill), London, United Kingdom (1810-1975)
Royal Mint, Llantrisant, United Kingdom (1968-date)
Under 'Comments' this is listed: Coins struck at Sudan Mint in Khartoum
Which is correct?