Portugal becomes a British colony

What if the British Empire pulls a Gibraltar on Portugal and also gains every Portugese territory including the Azores ? How and when could it be possible that Portugese sovereignity ceases to exists either de jure or de facto in favour of British rule ?
 
What if the British Empire pulls a Gibraltar on Portugal and also gains every Portugese territory including the Azores ? How and when could it be possible that Portugese sovereignity ceases to exists either de jure or de facto in favour of British rule ?

It's not, at best we could see a British-Portuguese dynastic union, but it would demand a medieval POD (at least one which doesn't include Spain).
 
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