You need to take the residence test, to determine your residence and domicile status.
If you are deemed resident, but not domiciled and you remit the gains to the UK, then you maybe liable to pay capital Gains Tax
There is a calculator at
Tax when you sell your home
This will help you work out the gains or losses.
You may be entitled to private residence relief, for the period that property was you main residence during the period of ownership.
Guidance on the residency test can be found at:
Guidance note for residence, domicile and the remittance basis: RDR1
If you are liable to pay Capital Gains Tax on the sale of this property, you will need to register for Self Assessment and complete a tax return.
You can register for Self Assessment at:
Register for Self Assessment