Wetroom leak remedial work- tiling prep conundrum

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Wetroom leaked.

Former and first course of wall tiles removed. WBP ply on joists (shower tray yet to be fit).

Grateful for tiling expertise on upcoming predicament.

Photos explain the following better:

Corner shower - one wall masonry (stepped-render?) and other brick inside studs.

Plan is to replace salvaged tiles once shower tray in.

My questions are regarding prepping the walls for tiling:

1. 12mm backer board on "brick stud" wall, (No more ply? Mapei addy (which one, Keraflex?) and tile. Will the "brick stud" need priming before the No more ply is attached?

2. Masonry wall looks like it was previously tanked as was a wetroom. Looks like stepped-render in photo? Also short of space for backer board here (see photo). How would you tackle this hurdle?

3. Does WBP ply edges still need sealing if only supporting a shower base and not a wetroom?

Thanks for any help/input.
 

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Your tiles have been dot and dabbed. Remove it all and do it properly.
 

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