CGT on United States Shares

I have sold some shares which I hold with my US based company. Prior to any tax, my stock account shows this as £44,000. This will be subject to 47% tax in the US. I am UK based and earn under £50,000 annual salary before tax. I have calculated that I will receive approx £24,000 after the deductions have been taken in the US. Will I still be expected to pay CGT one I receive this payment, and will I be likely to have an tax relief due to the amount of tax (47%) I have paid in the United States?

Hi,
Please refer to the link below for guidance:
Tax on foreign income
Thank you