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Urgent tiling job please

Some tiles in my 2nd bathroom are popping off the wall and it seems as though quite a lot need refixing as they sound hollow to tap. The wall behind is plastered brick and it seems to be age plus steam getting in as the shower is being used after a long period. I’m panicking because they might fall into my cast iron bath. The plumber will coordinate with you to move the bath out of the way to allow access. We really need to have it repaired so we are able to use the shower ASAP.