The comment I would make is that when they go to the Immigration Appeal Division, it's a de novo hearing. If it takes 18 months between the refusal at the mission and commencement at the Immigration Appeal Division, the Immigration Appeal Division will look at what happened in the intervening 18 months; I would hate to say this, but some of these cases will create a pretty good relationship record in the 18 months after the refusal, so it really doesn't tell us very much about whether the first decision was the correct one or not.
Evidence of meeting #5 for Citizenship and Immigration in the 40th Parliament, 3rd session. (The original version is on Parliament’s site, as are the minutes.) The winning word was resources.
A recording is available from Parliament.