Hello Mumsnet
Having the ability to change your username is great if you don’t want to have previous threads tied to that name - until you start a thread and forget to change your username halfway through.
Could you introduce a function that locks the user to the username they start with on a thread that would save the embarrassment of the OP if they forget to swap when posting further (and would also have the benefit of preventing sock puppeting by other posters on more contentious threads)?