After they got electricuted the second time and it didn't swap them back to the right bodies, they decided to live the lives of the other person as they had been for the week or so the series was set over.
The swap was successful, and they returned to their proper bodies, but realised there was more to life than the lives they had and wanted to start afresh.
I thought they had swapped back, but who knows that could have been a red herring. On the This Morning programme Paul Ross mentioned discussions are already underway for a second series.
They definitely swapped back. Danny's walk and talk changed back to the real him. Beside's, if the obviously desperate Veronica had still been in Danny she wouldn't have kept quiet about it.
I really enjoyed it. The actress who played Veronica did a fantastic job of a man struggling in high heels, her whole face seemed to change as well as her mannerisms.