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Yeah, to echo ^, look at the guttering certainly. I had similar in the recent deluge where the guttering at the front had gathered moss all in one spot, which caused the water to collect, all spill in the same place, catch the lip on the way over which directed it straight back onto the brickwork.
Always must've dried out as quickly as it got wet until recently when I found the bay window ceiling dripping onto the lounge floor...
Finding a tin of rool seal in the basement confirmed that it'd probably happened before too for the prev owners :/
Looks wet all down the corner, how’s the guttering above it? And it also looks like a real patchwork of repointing, maybe worth considering giving it a proper repointing that covers more of the surrounding area.