Well, I've been amazed at the possibilities I've managed to uncover without really trying. Firstly the curator of the AMS Museum Peter Starling, has been both helpful but also encouraging. The later is much in need at the moment.
Secondly, a search of the Imperial War museum's on-line database of its collections has thrown up a shortlist of 21 records to follow up. A quick phone call later and I'm off to the reading room soon to check the full(er) catalogue and see what else turns up.
Then the Journal of the Royal United Services Institute has been of great use. It has also been a great waste of time. Not because of any lack of information or accessibility but due to me getting distracted into reading articles on the British invasion of Tobago and the like.