Who was the James Bond character " Q " based on?

Ian Fleming based his character Q on Ulsterman Major Frank Hall. Hall became Military Secretary of the paramilitary Ulster Volunteer Force (UVF) formed to resist Home Rule for Ireland in 1912. Gudgeon's main premise seems to be based around the fact Hall went under the codename Q when he became chief of MI5 in Belfast two years later.

http://www.sluggerotoole.com/home/archives/000423.asp

Interesting. I have someone completely different.

The Secret War of Charles Fraser-Smith: The ‘Q’ Gadget Wizard Of World War II. Exeter [England]: Paternoster Press. Paperback. 1st printing: 1991. ISBN 0-85364-409-8 [£2.90 - http://www.bondian.com/books/69780431.html

Charles Fraser-Smith - The man who was 'Q'

Incidentally, the Q in Q Branch stands for "quartermaster", an adaptation of the British Army's "Q Staff", the department charged with procurement of supplies and materiel. A real-life "Q", the late Charles Fraser-Smith, crafted a variety of small gadgets and special devices for both MI6 and the Special Operations Executive during World War II. (SOE had been spun off from the sabotage and demolition section of MI6 itself.) His devices included spy cameras hidden in cigarette lighters, maps concealed in smoking pipes, and secret writing gear concealed in shoe heels. Ian Fleming worked with Fraser-Smith during the War and may well have based Q Branch on Fraser-Smith and his department. - www.secretintel.com/questions

Charles Fraser-Smith, the man who kitted out many British spies during the war, recalls that Fleming was fascinated by the hollowed-out golf balls used to conceal messages to prisoners of war, and equally amused to see the same device used to smuggle diamonds in Diamonds Are Forever. No prizes for guessing which character equates to Fraser-Smith in the Bond films. -
www.smh.com.au/articles

The secret battle against the Nazis also led to the production and development of a more sophisticated and sometimes bizarre type of gadgetry. Under the leadership of a man called Charles Fraser Smith (often cited as the blueprint for Ian Fleming's James Bond creation Q), SOE had a section known as Section XV whose job it was to create special tools for very secret work. - www.24hourmuseum.org.uk

Even Bond's gadgetmaker ``Q'' was inspired by wartime Head of Supply Charles Fraser Smith, and Dalzel-Job made good use of his inventions, including a compass hidden in a button. - www.dailyrecord.co.uk/news/REALBONDDIES

I won't pretend to know which of these is right. Please don't think my posting several sources means I am trying to prove my point by numbers; I am just trying to help us determine which, if either, of these is right. Perhaps someone from the UK could shed some light on this one.

And then again, perhaps not.