steve wrote:

I was thinking about just using a fine line of silicon sealant around
the tile to stop the leak, but as the tile appears to have started
moving, is it inevitable that it will fall off at some point? And if
so, is it fairly straight forward to remove a tile and replace it?

If it is already loose, then remove it (clomp with hammer first if
required!), scrape of the adhesive residue from the wall and fix a new
tile. Try and use a full bed of waterproof adhesive if possible.

--
Cheers,

John.

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