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I am an advisor at JA and happy to assist you.
If you are non resident in UK then you don't need to pay tax in UK. You'll pay tax in the country you'll move to. You need to submit P85 to HMRC.
If you send P85 to HMRC and they accept it - That's the point where HMRC will issue non resident tax code and you won't need to pay any taxes in UK afterwards.
With regards ***** ***** side, I'll suggest that you speak to an accountant in Austria.