Hi,
Rental income is not covered by the double taxation agreement and this remains taxable in the UK.
You are now considered a non resident landlord and will therefore need to complete a tax return to declare the rental income. You will also claim the refund on the PAYE income from this. You need to complete the SA109 as non resident and also complete HS304 and include a residence certificate from UAE. You can see guidance here:
Tax on your UK income if you live abroad
Thank you.