Thank you. I’m a bit of a WW2 buff and had never heard of this.

Try this novel. “Dark Voyage” by Allan Furst. Dutch cargo ship is seconded to the British in 1940. Repainted and renamed as a Spanish ship, they carry out missions for the Allies

https://bookshop.org/p/books/dark-voyage-a-novel-alan-furst/d7be8eb0ae1642e6?ean=9780812967968&next=t