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Waterproofing exterior concrete block downstairs wall

After heavy rain there is water seeping from underneath the tiled floor of my downstairs bathroom. The bathroom is on an exterior concrete block wall and advice I have received is that the blocks need re-sealing/waterproofing . The house is a 1960s bungalow - with concrete block base and weatherboard above. It is on a sloping section so water run off goes down the side of the house. I have cleared drains so it is not caused by a blockage, so I think it must be seeping from the ground against the block wall.