non resident owner CGT on sale of property

In below link reference is made to CGT being applied only after April 2015 for non residents for the disposal of a UK asset. Is this the case or do other conditions need to be met. What would those other conditions be?

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Hi antwillant

There was no link in your question. For guidance on non UK resident capital gains please refer to
Tell HMRC about Capital Gains Tax on UK property or land if you’re not a UK resident

Thank you