CGT calculation on property acquired as a non resident then sold after returning to Residency

I noted that the CGT calculation takes into account a period non residency. If property was acquired while non resident and owned for say 10 years while non resident. Then sale of property occurring within 18 months of returning to resident status. How is CGT calculated on the increased value of the property?

Hi,
Capital Gains Tax liability is calculated by deducting acquisition costs (including acquiring the property) and disposal costs from the disposal value.  
Only if you were non UK resident at the time of disposal, can you use the rebasing date of 05 April 2015 in the acquistion cost.  
There is a calculator below to help you work this out.
Tax when you sell property
Thank you.