The Philippines is highlyunlikely as the Spanish started colonization there long before England had even begun colonizing anywhere and would remain a highly important colony to Spain.
Manila was occupied by British forces (from India) towards the end of the Seven Years War, but given back at the peace treaty... and if it hadn't been given back
then, it might still have been regained by Spain as a side-effect of the ARW, instead.
However, if Napoleon hadn't turned against Spain when he did there was a British plan to ship troops from India across the Pacific into Latin America: Maybe if that had gone ahead then the expedition might have stopped off to seize some key points in the Philippines along the way (even if, as things worked out, that actually meant that it didn't get any further east...) and Britain might have kept them after
that?
Alternatively, there was an incident during the early 1870s when Spain simultaneously antagonised both Britain and the USA: IOTL the crisis was defused, but how about an Anglo-American alliance against Spain
then with the USA seizing Cuba & Puerto Rico while Britain takes the Philippines, maybe part of Micronesia, and perhaps Spanish Guinea (at least the islands of Fernando Po & Annobon, if not the mainland as well)?