Major Thorpe (writer and artist), Mort Leav (pencils and inks)
Published in Jumbo Comics #43, Sep 1942 - 8 pagesZX-5 in undercover in France as a Doctor Larue when a pair of Resistance fighters come into his clinic fleeing the Gestapo. When the pursuing German soldiers arrive, one has a wound to his leg which they insist Larue tend. This soldier just happens to know about a major upcoming air raid on England which ZX-5 must now alert England about.
Here are the pages I have of it.