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The UK has no exchange controls. Just warn your UK bank of the incoming funds and their source to preclude any money laundering inquiries a large transfer might otherwise attract.
Was this Polish house your sole or main domestic residence ie the only one you owned?
In that case as far as UK Capital Gains Tax (CGT) is concerned Private Residence Relief (PRR) applies which relieves CGT at 100%. The money will not be subject to UK taxation.
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Not as far as the UK is concerned.
None whatsoever, PRR is given automatically.
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