As a cause I suspect there has been some heave and settlement along that wall.
If the brick built shed was there when you first rented, its the landlords responsibility. Even if its not listed on the tenancy its still not yours, and you have no redress.
If you built it or had it built then you are in a world of agro over location re use of party wall, quality and suitability of construction, age weathering etc.
Think I am saying, legally you are going to go nowhere.
That leaves, finding the cause, and fixing it as the far more likely, easier, faster and cheaper route.
Now is the damp rising, seeping low or falling from higher?
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Damage to brick wall. Who is at fault? new
Damage to brick wall. Who is at fault? new