Not sure from where people are getting the idea of submitting letter from University to fulfil English Language requirements - because nothing of this sort is mentioned in the
Tier 1 policy guidance or the
UKBA website.
This (letter from University) used to be practice in the HSMP days when it was mentioned that such a letter was acceptable by UKBA. But this was many moons ago! And no longer accepted as valid evidence!!
The Tier 1 (General) policy guidance clearly explains how the applicants can determine whether or not their qualifications meet the English Language requirements (points based calculator), and in absence what is the alternative (e.g. - English Language test).
regards