In the wake of BellaM's post, there was, it is understood, an embarrassing internal row in the Guardian. Though she was not disciplined, she was, as the JC reports today, "reminded of the paper's guidelines that staff posting on the site should uphold a high standard of civility and avoid any behaviour that brings the Guardian's good name into disrepute."
BellaM, according to CiF Watch, is actually Isabella Mackie. Mackie is the maiden name of editor Alan Rusbridger's wife.
A Private Eye report noted that "Isabella Mackie, a recent graduate, had the grace to use her mother’s surname when taking a job on the Guardian’s website to disguise the act that she is the daughter of the paper’s editor, Alan Rusbridger."