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That's what I wondered (re granit). I'll have to query the materials.. And get another few quotes while I'm at it
gillies-
Send the photo to Mark that I linked you on the Locohome chat. He’ll probably want to come out, although he might not stretch as far as Southside (if I’m recalling where you stay)
Covering all the coping stones with lead seems a little overkill. If the issue is the joints on the coping stones would your neighbours potentially have ingress as well? Might be worth a check.
andos
Is 'COPPEN' meant to translate as coping stone,
the full width components leading down and away from the chimney stack.
'Granit', (granite?), when crushed into a powder or fine gravels has no particular waterproofing properties.
Any cementitious site mixed grout or mortar will have poor adhesion and will shrink and crack,
leading to further water ingress.
A quality elastomeric sealant will give good unprimed adhesion, bonding to the coping stones with a waterproof seal.
Depending upon ease of access, there's barely a morning's work rebedding those coping stones.