GTE maybe more current than me (I joined 1985) but my UAS interviewed early in the term. I wrote before the summer holiday and had an interview arranged before I'd even arrived. Things may have changed, but a quick phone call to the admin officer can't do any harm. Good luck, you'll enjoy it!
BTW Have you taken a year out, are very confident, have esp or know the A level markers? Seems early to know that you "are going to uni in sptember".
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Another day in paradise