No, I sat my as' in year 12 and a levels in year 13, it was just that my english literature course was linear.
Just an update for you all....I've spoken to the uni's and the feedback so far has been:
Durham: LNAT and PS/Reference
UCL: LNAT
KCL: LNAT
Still have to hear back from Bristol, but in the meantime I've decided to firm Warwick.
Thanks for all your replies!