Help! I have uploaded a photo of fittings that have been weeping, for a long time, beneath a sink in my daughters (recently moved in) house. The hot water had to be turned off because of big leak under floor. The pic shows tails from the mixer tap, beneath which is a stop valve, with no nuts to undo, then a compression fitting? Then a flex coupling, beneath that and not shown on the photo the flex coupling has a stop valve and compression fitting onto 15mm copper pipe. This needs to be connected to new pipework 15 mm copper that diverts around the underfloor leak. Suggestions please!