London: reseal bath. remove existing sealant & fit fresh - currently leaking (ended)

reseal bath. remove existing sealant & fit fresh - currently leaking

The seal around the bath is letting water go through behind the back wall and down the back of the bath and running down the ceiling to the lower floor. It's a normal standard rectangular bath. property rented so will need to be done from 9am (when all tenants have finished using the bath and be ready by the late afternoon. Currently have an additional bath curtain around the wall & sealant - held up using gaffa tape onto the tiles to keep the water from going on the back wall. Bathroom is tiled.
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