Listed Building Consent To Rake Out And Grout All Mortar Joints - External Pointing - Mortar And Carefully Replace With A Homogenous Non Hydraulic Lime Mortar Mix Carefully Matched To The Original Mortar In Composition And Appearance. Installation Of Stainless Steel Retro-Fit Wall Ties. Replacement Plasterboard And Polyisocyanurate Insulation. Localised Installation Of Meshed Cavity Drain Wall Membranes. Replacement Of Wall Ties