Marks and Spencers rejection?

Hi all,

I applied recently to Marks and Spencers, mainly as a back up as I have already reached the assessment centre stage with Barclays, Lloyds, Pwc and the Civil Service.
I just recieved an email saying I was unsuccessful and did not meet their academic requirements when in fact my academic results are very good (First Class Honours, 360 Ucas points + two additional B grade A-levels, 10 GCSEs all grades A or A*).

Was wondering if any one else has experienced the same thing?
I really don't believe that my grades could not be good enough for this particular role, so do you think this is just a generic rejection email and that the real reason was something else (not enough retail experience, perhaps)?

Thanks for your help.