A quick read of HMRC's stuff on this indicates that if you are resident, you pay CGT.
You'd likely (I've not checked if there is a treaty in place) get double tax relief on the Portuguese tax paid though.
Yeah. But it's very unlikely there is no tax to pay in the UK if you resident, and the question was about whether there was a UK tax liability. There is, if they are resident and not something weird like Non-dom.
@Howard started
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You'd likely (I've not checked if there is a treaty in place) get double tax relief on the Portuguese tax paid though.