6 A*s and 4 As only
decent?
No it's not true. Yes departments might look at your GCSE results, some place quite an emphasis on GCSE results, but those that do often use a GCSE standardisation score (more on that later) and even then probably don't look for an specific number of A*s. History claim that like a high number including an A* in history, economics and Durham-based psychology that they
prefer applicants with all/the majority of their grades at A* and A.
Now, as for the standardisation score, this is when your school might be taken into account. Every school in the country is given a modifier score. The lower the score, the "better" the school. So a student who achieves mainly As at a school with a modifier of 1.8 is more of an achievement than a student who achieved similar results (even slightly better) but went to a school whose modifier is, say, 0.2. Most of the Durham's departments use this method.
A list of departments who use the GCSE standardisation score can be found on the university's website (economics do, politics do not but then economics is the lead department in politics and economics joint honours therefore your application will be considered by economics - someone correct me if I'm wrong). You can also find your own school's modifier school by clicking on the relevant link at the bottom of the page.
http://www.dur.ac.uk/undergraduate/apply/faqs/?faqno=1482But I can tell you with certainty that you do not need 8 A*s for politics programmes at Durham. You will not be instantly rejected just because you "only" have 8 A*s. If you have a stronger personal statement and reference than some of those with 8, 9 or even 10 A*s then you're probably in the stronger position. So just work on that personal statement and those A levels!
Good luck!
Eeep....I knew my old school has a low modifier (meaning that it's one of the top-performing schools) but thought it was 0.3 not 0.1