I'm not so sure about Caroline coming back, I wonder if that scene at the funeral was more about showing that she wasn't really all bad, and also showing Connor's reaction to her - that he isn't desperate or gullible enough to take her back after what has happened.
It's possible, I suppose, that she might have come back at some point, and it would be interesting to see how Connor might have reacted to her in series 3, or even series 4, when things weren't going so well with Abby.
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It's possible, I suppose, that she might have come back at some point, and it would be interesting to see how Connor might have reacted to her in series 3, or even series 4, when things weren't going so well with Abby.