Series 3 of the crime drama is currently airing on Wednesday nights at 9pm on ITV and concludes next week.

> Order Series 3 on DVD on Amazon.

Jones, who plays D.C. Rachel Bailey, teases: “Janet is going through a divorce and then Rachel goes to live with her for a while. They are good friends but end up being really vicious with each other. Some of the things we say to each other are outrageous.”

However, the former Coronation Street star insists her real-life relationship with her co-star is different: “After three years she’s like my big sister. To see those big blue eyes every morning makes me smile because she’s just brilliant and I love her.”

Lesley Sharp, who plays, D.C. Janet Scott, explains: “Janet is asking herself some pretty serious questions about her relationship with Rachel and whether she actually likes this woman. It’s about those two characters both being vulnerable and clashing with each other when neither one of them is strong enough to support the other one. That’s what we’ve seen up to now. When one of them is feeling vulnerable usually the other one is there to make that better. And unfortunately both of them are at a point in their life where they’re not feeling great.”

She continues: “It’s a moment that flares up and then things get said that are borne out of frustrations and that could possibly have been sorted over a cup of coffee and a good, frank conversation. Before you know it you’ve got two friends and colleagues who combust. Rachel and Janet work very well together but as people they’re very different. Their situations and the way that they deal with their personal lives are very different. “So it’s no surprise that when their personal lives become as embroiled as they do, that actually that’s going to cause a problem.”

Sharp explains: “Rachel probably reminds Janet of herself when she was younger and she thinks Rachel is potentially a brilliant cop. So it’s disappointing for her that Rachel seems to make bad judgement calls every now and again. But, as is always the way with Janet, there’s a streak of fairness and generosity that runs through her, which allows her to see a bigger picture. It’s nice playing a character like that.”

She adds: “Both Suranne and I have really enjoyed exploring that situation. It’s very meaty stuff.”

> Buy the complete Series 1 & 2 boxset on Amazon.

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