There are no guarantees in the TV drama business, but a new series on TV One has certainly got solid gold credentials. It's co-created by Rachel Laing, who's by far our most successful writer on the big or small screens. And it features one of our biggest stars, Jennifer Ward-Lealand in her first prime-time TV role since the 1980s. Lynn Freeman talks to Rachel and Jennifer about Dirty Laundry - a steamy mixture of family drama, crime, money, secrets and lies.