This is from the RAF website, although I can’t pin down its specific location there. Apparently it was an aircraft involved in the 1991 Gulf war.
Did The Guardian support that war?
(Hat tip: Dr. No in the comments.)
Update: “The Guardian Reader” is listed here (41 Squadron, RAF Coltishall) along with “Johnny Fartpants,” “Fat Slags” and “Buster Gonad.”
Habibi has provided a link to the source web page.