If you were born in the UK to British parents then you are taxable on your worldwide income and gains whether you bring then into the UK or not. You would be liable for Capital Gains Tax on a property gain but would be get credit for any foreign tax paid in the country where the property is situated. CGT is charged on residential property gains at 18% or 28% depending on the level of your income in the tax year the gain is made.
If you were not born to British parents, then you may be non-UK domiciled which gives you the following choices:
1 You can be taxed as any UK national resident in the UK is, ie on their worldwide income and gains.
2 You can choose to be taxed on your UK income and on non-UK income that you remit to the UK with credit being given for foreign tax paid on against any UK tax liability on the same income or gians.
See Section 9 of RDR1 for more information on the remittance basis of assessment.
After you have been resident in the UK for 7 of the previous 9 tax years, you will have to pay the remittance basis charge if you wish to continue to use the remittance basis of assessment. See paragraphs 9.29 to 9.43 of RDR1. The charge increases after you have been resident in the UK for 12 of the previous 14 tax years. After you have been resident in the UK for 15 of the previous 20 tax years, you are for all intents and purposes taxed in the same was as a UK national, ie on worldwide income. See here.
I hope this helps but let me know if you have any further questions.