The list doesn't entirely surprise me - and stats are going to be largely skewed by the particular sector (i.e. which companies) are counted there. Some universities have actually very good departments in certain subjects, but their overall reputation wouldn't cause you to reel them off on a list of the best. For that reason, i'd approach changing choices based entirely on this with caution.
Edit: another very interesting thing to consider would be the size of the institution - it looks like Manchester and Notthingham are near double in size (quick google on enrollment figure from wikipedia) compared to the handful below at least. Reaching more graduates by going there...