Gwen had better hope Jack never hears her calling Ianto that! After the hell of Psycho!Suzie and her treatment of Ianto, I don't think Jack will put up with even a tiny bit of disrespecting Ianto from PC Cooper. Especially since she just opened one hell of a can of worms for the rest of them to deal with and no amount of apologizing or offers to fix it are going to solve this problem.