I would guess the main factors are a) the huge range in prestige or quality between universities and b) the large number of media and business degrees that are classified as computer science.<p>On the first point, look at the difference between the numbers at the top and bottom of this table:<p><a href="http:&#x2F;&#x2F;www.theguardian.com&#x2F;education&#x2F;ng-interactive&#x2F;2015&#x2F;may&#x2F;25&#x2F;university-guide-2016-league-table-for-computer-science-information" rel="nofollow">http:&#x2F;&#x2F;www.theguardian.com&#x2F;education&#x2F;ng-interactive&#x2F;2015&#x2F;may...</a><p>These rankings are nonsensical in many ways, but some universities consistently appear towards the top and some towards the bottom and the employment stats plummet towards the bottom of the table.<p>On the second point, click on a university name in the link above and you will see a list of degrees. You can a) see that &quot;Computer Science&quot; can mean all sorts of different things and b) you can click on the degree name to see the actual course contents, which may not match what you think of as computer science:<p>* Business Information Technology BSc (Hons) <a href="http:&#x2F;&#x2F;www.lsbu.ac.uk&#x2F;courses&#x2F;course-finder&#x2F;business-information-technology-bsc-hons#course_tab_modules" rel="nofollow">http:&#x2F;&#x2F;www.lsbu.ac.uk&#x2F;courses&#x2F;course-finder&#x2F;business-informa...</a><p>* Computer Graphics Technology BSc(Hons) <a href="http:&#x2F;&#x2F;www.kingston.ac.uk&#x2F;undergraduate-course&#x2F;computer-graphics-technology&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.kingston.ac.uk&#x2F;undergraduate-course&#x2F;computer-grap...</a>