Hi anthea_vv w,
This 'power of attorney' document allows your parents to let the property on your behalf.
You are the legal and beneficial owner of the property, so any income it generates is yours and you are liable to pay tax on it.
Hong Kong have the right to tax this income first, as part of the UK / Hong Kong tax treaty (
Tax treaties).
You will also be liable to pay tax on this income in the UK.
This foreign property income should be declared in a self assessment tax return.
The tax treaty allows you to claim a tax credut of up to 100% of the tax paid on the income in Hong Kong.
Thank you.