However, it's important to note that "ng'ombe" is a broader term meaning "stone" in general, not specifically "English stone". There isn't a specific Kikuyu word for a particular type of stone like "English stone".
It's possible the term "English stone" refers to a specific type of stone used in English architecture or construction. If you can provide more context about what "English stone" refers to, I might be able to give you a more accurate translation.