Skilful regular pointing of granite in Voundevour Lane.

Neat it may be, but this is what I would view as bad pointing. It is on the face of the stone, not set into the joints. This will only serve to slow the water flow and to encourage it in to the stonework. There is too much mortar on the face of the stone. Eventually frost attack will damage both pointing and stone.
Get some guidance at
http://www.ni-environment.gov.uk/tn37_repointing_stone_and_brick-2.pdf