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d) repoint / repair (with lime mortar), install stud with insulated plasterboard
a) & b) are great options, but finding plasterers that do a good job with lime is not that easy. Then there's the finish to consider - if you skim with gypsum, or paint in something that's not lime / clay-based, it detracts from the whole point of going with lime in the first instance
c) is puppy killing. And can exacerbate damp problems, as it takes away the permeability of the wall (something about temperature differentials, osmotic gradients, water vapour and the like).
If there is damp in the future, and you need to get back to brick, then removing cement render will fuck those soft bricks.
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This wall is in a pretty bad way. You might need sections of it helifixed and then a mesh placed under the plaster to tie it all together. Pick your tradesmen carefully would be my advice on this.
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NotThamesWater
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@terlg
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..
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