Phil L wrote:
Calum wrote:

Yes, the walls have been dot & dabbed. The wall may not have looked
wet before. Work began in the winter when we had lots of snow, and
ice and things were actually quite dry.

The flashing's failed, it needs replacing and *not* patching up.

Personally, if it were mine, I would want something other than lead as I
don't think it's suitable in this application.

Oh its suitable, but its not a complete answer.