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Any suggestions on how this water is getting in? I previously thought it was my broken external cill however I have had this re-built

There is no visible damp from above, it's like it is coming directly through the wall at that location but there is no obvious damage to the wall outside

Hi bullbates1,
If you are referring to the small damp patch below the window sill, this may be a particularly porous patch in your solid walls.
If you are referring to the staining emanating from the sill box section of the window, it may be that a drain path has not been made for the condensation forming inside the window sections.
Regards S