Have a more British Scramble for Africa

Is there another way for Britain to create a more prominent holding in Southern Africa? Is there a way for Britain to take the Portuguese holdings in Mozambique and Angola? POD must be after 1800.
 
just have the Brits declare they're taking them over. Portugal, in the 1800's, was never in any position to stop them. Do it between 1807 and 1813. Tell P it's to protect shipping lanes (just like they did with Dutch south africa), that it's the price P has to pay to get the motherland (Portugal) back, since Britain was the de facto occupiers/rulers there.

Britain took whatever it wanted from ashes of the Napoleonic wars, so simply give them a reason to want Portuguese African possessions.
 
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