Kym Marsh has reportedly split from her third husband Scott Ratcliff just 18 months after tying the knot.   According to The Sun, Kym, 46,  and army major Scott, 34, decided to end their marriage due to the strain of work, but ‘cracks’ had been present in the relationship for some time.   It was reported that the pressures of their careers led to the couple first attempting a trial separation , before deciding to officially split.   While mother-of-four …