Try the Trenchard Hall Library at Cranwell, contact details via
http://www.raf.mod.uk/rafcranwell/contactus.cfm. It's probably better to write as the phone number may only get you as far as the MoD operator. They have got copies of Air Clues going back to the year dot, and may copy the article that you seek if you ask them nicely and/or offer a small donation to the RAFBF.