*I* think it was a farewell tour. That is, farewell to who she'd been up to that point. She already knew that once it was over rock-chick Polly was going into the dressing-up box, never to be taken out again; and, more seriously, that with that album she'd reached the end of what she could do with the format she'd essentially been working with up till then. New directions from that point - hence all the jokey self-referencing. Also perhaps slightly defensive, given that she thought UHH was 'the closest I've ever come to plagiarising myself'.
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