This document has just been published on the Internet.
It was a PhD thesis being completed by John Mably, who was a swordfish pilot during WW2. Unfortunately he passed away before completing it, however the University felt that the work he had done was important, and so they tidied up his draft, and gave him a posthumous MPhil.
It appears to have sat in their library since 2004 until I put in an inter-library loan request for it a couple of months ago, when it would appear that they decided to scan it and put it in their online thesis repository.
You should be able to access it through the following link.