AH Challenge: Anglo-Portugese War

I am talking about an open war, not some proxy war. It has to be an open, conventional war with England on one side and Portugal on the other.

The challenge is that the POD can be no earlier than 1573, 200 years after the Anglo-Portuguese Treaty.
 
Probably a lot later than you might want but in the 1870's-1880's the two faced off over central South Africa. Lisbon hoped to connect its Angola and Mozambique colonies overland, while Britian's dreams of Cape-to-Cairo made this a little tricky.

In OTL Portugal saw sense and backed down from Britannia but perhaps localised fighting sparks something? Strikes me as an interesting parrallel to the Spanish-American War.
 
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