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basement Leak

Hi, i have a leak in my basement that is is under the kitchen and washhouse area and that side of the house where the basement is, is underground. The leak is where there is a corner and the skirting board has come away for both ends where the corner meets. This is the first time i have seen a leak which has formed into a puddle today. Can someone advise what the best things to do is or who is the best person to look at it.