Replacing cement mortar that is blocking evaporation and causing wet cold walls. Repointing with the correct lime mortar that will allow evaporation while maintaining an adequate weatherproof outer skin. This has the added effect of presenting the stonework in its original bright well-defined style.
The second picture below shows the work in progress – right hand elevation complete and left-hand underway. The first picture shows the job complete, left and right elevations and the centre elevation and porch lower priority for treatment in the future.