My student loan appeal has gone through and they increased my allotment by $623: not quite the expansion for which I was hoping. Essentially, the reason for this is that they have pre-set formulas for allotting loan amounts that adapt poorly to the nature of an Oxford education. They are based on the cost of living in Canada, and they do not reflect understanding of how Oxford terms work. They certainly do not reflect the extreme cost differentials between attending graduate school in Canada and doing so in a place like this.
A word of warning to future applicants: do not expect even half as much student loan funding in your second year as in your first; this, they ought to make clear before you go. In my case, seems as though some kind of additional fundraising is going to be required, if I am to make it through Trinity term and my exams.
See also: prior ravings about school related government bureaucracy.