Page "Dr. No (novel)" Paragraph 17

After Diamonds are Forever was published in 1956 Fleming received a letter from Bond enthusiast and gun expert Geoffrey Boothroyd, criticising his choice of firearm for Bond.

Boothroyd suggested that Bond should swap his Beretta for a Walther PPK 7. 65 mm, an exchange that made it to the novel.

Boothroyd also gave Fleming advice on the Berns-Martin triple draw shoulder holster and a number of the weapons used by SMERSH and other villains.

In thanks, Fleming gave the MI6 Armourer the name Major Boothroyd in Dr. No and M introduces him to Bond as " the greatest small-arms expert in the world ".