You can keep trying, but to be honest, going off the availability during last couple of years, I’d imagine it’s unlikely you’ll be able to get an appointment within a week. Though you may be lucky and find a last-minute cancellation.
I think most people generally end up waiting around 2-4 weeks for an appointment… even the ones that are supposedly ‘same-day’ or ‘next-day’ often have a wait of a couple of weeks… so there being availability on 14th September is actually pretty good for UKVCAS.
The Super Priority service only applies to the processing time after you have attended the appointment - but there’s no guarantee that you’ll be able to book an appointment for right away.
Have you tried looking at centres in other locations too? There are different types of appointments offered at different centres, so you may have better luck trying another centre.
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