Welcome to the forum
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They only say that about priority to cover their own backs (so you can’t complain if it takes longer)... it’s still worth paying for it even with a refusal, because it means your application skips the majority of the waiting line (so it goes through the priority part before they even know you had a refusal).
Which unfortunately means that if you had paid for priority, you probably would have got your visa a few weeks ago
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On the plus side, after 12 weeks, you shouldn’t have too much longer to wait now
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