CPs were a legislated "fuck you" to same sex couples, and if they weren't they'd have made them universal to start with. I'm all for Civil Unions of some description, but for straight people to yell discrimination because they don't have access to something that absolutely discriminated against others really rankles, tbh.
I interviewed a gay man in his 70s back when Civil Partnership legislation was passed who said he would never enter into one because he would forever be legally registered as homosexual and he was scared about who could access that information. That might seem paranoid, but not to a man who had been forced to live his life in the closet for 50 years.
We had to live with the fact that we are forced to out ourselves by our "partnered" status because we couldn't describe ourselves as married.
Couple with religious faith who could only access Civil Partnerships to legally formalise their relationships weren't allowed a single reference to faith in their ceremonies. Not music, imagery, text.
And you cannot cite adultery as grounds to dissolve your partnership.
Civil Partnership has always been Less Than, and it feels like gross privilege not to recognise that.