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  • @airhead, thanks for the info! Windows are casement i think (the whole house is only 6yrs old), they don't look like sash windows from my (admittedly limited) knowledge of these things.

    The gap on the outside just looks like the edge of the sealant isn't fixed to the window sill well enough - to be honest i'm amazed any water has travelled right through, but there is a kind of line of loosened wallpaper on the inside from the same corner which is what makes me think some has. It all looks superficially in good condition so I'd be surprised if it needed much doing to it, but then again something doesn't appear to be right

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