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Sorry for the late reply. No, it's not a new build. My complete lack of knowledge showing here. My house is a semi, built in 1959. I've not had this problem before. On rare occasions I've had a small amount of water, but hardly anything but now it's a concern. I don't know what to do for the best. There is room to stand up under my floorboards, so room to work. I think I've spotted where the water is seeping in, but don't know how to proceed. Just point it up or go for tanking. I'm wary of touching it in case it should just come away and allow more water in. I'm sure I need a new damp course anyway, but unsure how to deal with the ingress. Any help or thoughts would be welcome.