Underground damp kitchen wall - membrane and stud, tanking or just tile?

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Hi all,
We've a smelly kitchen, tiles starting to fall off.
Walls are rubblestone, uneven, plastered (some tiled)
We don't currently have an extractor

-One underground wall is studded out to halfway along it, boarded and tiled - we've not yet had the units off to see behind, but suspect damp and mould there. the other half of that wall is plastered stone, and is dry

What we're wondering is how to get that wall flat enough to tile, and not have it damp

We're thinking:

-Maybe it's condensation behind the units or inside the stud
-Maybe there's some penetrating damp from the ground behind (we do sometimes have a small spring come up from the floor tiles...)

I guess we need to get units off and investigate, do the clingfilm thing etc

...and then decide:
-if the wall can be evened up enough with render
-do they need tanking
-do we membrane, insulate, and stud to even them up

I'd appreciate if you could give me any thoughts, pointers, suggestions

Thanks in advance, Stephen
 
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