Beginning the long journey of renovating a fairly untouched (since the 70s) victorian flat. left some demo/waste guys with the task of clearing it/stripping the old cracked plaster off the walls in some rooms. In the bathroom extension, they chipped off the cement render revealing (probably contributing to) some pretty awful brick work (double skin solid wall).
Plan was to dot-dab insulated plasterboard on this wall to improve thermal comfort.
Options in my mind - a) repoint/repair using lime based mortar, b) render in lime based render, c) render in sand and cement.
Or, give up..