You should at section 5 of RDR1 here for the definition of domicile.
If you are UK domiciled, you are taxable on your worldwide income and gains with credit being given for foreign tax paid against the UK tax liability on the same income or gains. If you are not UK domiciled, you have the option to use the remittance basis of assessment which you can read about in section 9 of RDR1.
The gain will be about £70,702 (£213,422 - £122,720 - £20,000) if you take half the renovation costs into account. The first £11,100 will be tax free leaving you with a net taxable gain of £59,602.
There are two rates of CGT for residential property, 18% and 28%. The rate or combination of rates that you will pay will be dependent on the level of your income in the tax year you sell the property. In 2016/17, the current tax year, no more than £32,000 of the net taxable gain can be charged to CGT at 18%. If you let me know how much you earn, I will calculate the CGT for you.
I hope this helps but let me know if you have any further questions.