The lead on the top photos appears to be standing out proud of the brick vertical line, with a lump of sand and cement on the top.he's sent through two of the 4 pics, i've asked for the others which i think show the lead a bit better....
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Details like this can lead to ingress, anything running down the brick stack will hit this little shelf, and the sand and cement will crack away from the bricks and let in water behind it, as the crack grows : pointing fails and falls apart, it will channel water into the stack, not away.
Lead is notorious for moving through the seasons, sand and cement mortar, not so much.
