Hi DSS,
Your income earned in the UAE, in a tax year you were not resident in the UK, is not taxable in the UK.
Any savings from that income can be brought into the UK and is not taxable.
For the tax year in which you move to the UK, you will need to review the guidance at RDR3 and take the residence tests.
The outcome of those tests will determine whether the income would be taxable in the UK.
RDR3 Statutory Residence Test
Thank you.