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This was my other thought. Take it back to brick and stick insulated plasterboard up to tile over. The tile backer board looks like a great shout. Having never used it before would that just be a case of sticking that to the brick with some adhesive?
Pmccee-
I haven't used it, but will be when I redo the bathroom. Although we have timber frame to fix onto.
I believe solid walls would be a few dots of adhesive to level the boards on the wall.
Then fix inplace with the large headed dowels (hammer in rawl plug style)
Depending on the manufacturer, theres probably a minimum thickness of board recommended for solid walls. Thin boards may flex too much as the dabs and dowels only offer local support.
user69121
https://www.protilertools.co.uk/product/wedi-tile-backer-board-2500mm-x-600mm--choice-of-thickness---individual-
Being an external wall, an insulated tile backing board would keep the tiles warmer than being onto plaster.
It would mean stripping the wall, so more mess and its going to be more expensive upfront. Though less condensation on the wall and reduced heat loss in the future