Helon

I left UK in July 2023, deregistered with HMRC, no further ties or income or property. Pension in Denmark works other way round, my contributions and employer contributions are taxed before the are added to Pension account. What is my UK tax position if I return to the UK, as pension has been taxed I was told there is no tax to pay on pot in UK. Do I have to be careful when to transfer to my UK account (before returning better for ex)? Thanks Richard, Copenhagen