有居英權，是否隨時可以去英國買樓定居?

Are you living in Hong Kong/Macau or Taiwan?
If you're living in Taiwan > https://www.gov.uk/world/organisations/british-office-taipei.zh-tw

當然可以，不過買樓不是必需，但乞討救濟就免問

No and yes.

No - you don't need the right to abode to buy a property. You simply need adequate money.

Yes - you can live in the U.K. at anytime you want.