Thanks, I see what you mean in every case being different. I just wanted to get an idea of what reason(s) CIC could have to call anybody up for an interview. I see many profiles which state interview Waived, which leads me to ask what are they looking for (or is it a random selection process).
In addition, I see that certain VISA Offices can process applications quickly whilst LONDON (my visa office) can take some time. This is likely due to the fact that PAKISTAN applications are also processed here (Pakistan has one of the highest number of applicants). So the question is then asked, does being british and applying from your home country's visa office speed up the process?