I'm sure you will agree that any attempt to malign a Crown witness even after 28 years is a serious matter? Does this extend to former senior police officers who were involved in the Bamber case and who now find themselves the subject of unwanted attention in their retirement?
In what way? There is no difference between someone who has been a prosecution witness and any other person. If they are defamed they have the right to sue for slander, or in the case of something on the internet, for libel. If they have sufficient grounds they can obtain an injunction (now called a restraining order), damages and costs.
I very much doubt if Julie Mugford will sue anyone for libel, for various reasons.