Thank you for your question..
As the property in Dubai has been your main residence for the last 9 years, you would be able to claim private residence relief against your gain for that period. You would also claim additional relief for the final 18 months of ownership as the property in question was your main residence at some point during period of ownership.
It is your intention to rent out the property to supplement your pension/income.
This rental income would be subject to UK income tax as you would be a resident in the UK for tax purposes.
On sale you would be able to claim letting relief for the period the property is let.
Once you take into account aforementioned reliefs and allowances, any remaining gain would be chargeable to CGT at 18%, 28% or a combination of both depending on your total taxable income (including the gain) in the year of sale.
More information on Private residence relief available on sale of residential property is covered in HS283 here
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