Okay, the website is in England so I presume this is an English question. By the way, before I answer the legal question in USA terms, there is no such thing as a "United Kingdom", that is part of the communist propaganda the British establishment brainwashes the people in England with, to control the population in the same way as in The Wizard of Oz: England ceased being a monarchy in 1824, after 600 bloody years of trying for freedom from the cruelty and tyranny of the royalist system - and in that year finally succeeding - in breaking the wings of the monarchy, when Parliament finally had the guts to stand up to King George and pass laws OVER the king, thus which nullified the British monarchy (monarchs do not obey laws, they are the law over everything else, which is why they are monarchs: true monarchs own everyone and everything within the realm!)
Now to your question.
In our USA, we have a Constitutional provision that protects both against being required to testify against yourself in any way that might incriminate yourself WITHOUT LYING ABOUT IT, and, protects spouses from having to testify against each other. That legal and Constitutional provision is beyond being reasonable, it is essential to protect against disloyal adversary discord within the family unit, which can actually "back-fire" to prevent rehabilitation and preservation of the family association.
There are other ways of looking at remediation. Evidence in the form of official medical evaluations preclude any false statements made by the married parents of abused children. No amount of deceptive fabrication of facts will hold up when bruises, cuts, fractures and mental trauma are evident in any child.
Mental abuse may be harder to prove and document, but the signs are often always there anyway. Children find it harder to conceal abuse the younger they are. From the ages of five years to adolescents, they are more prone to confess the truth to authorities than most parents realize. The problem, of course, is when a child is so traumatized that he or she then begins to fantacize and "imagineer" events and facts, but mostly, they are quite honest.
There are also problems in our USA with the laws which say a pre-pubescent minor is not a reliable witness, and their testimony often cannot be used to implement a court case. That can be circumvented when a licensed, qualified and experienced child analyst can delve into the child's statements and use background evidence to corroborate or refute what the child said.
Maybe a British barrister or USA lawyer will read your question and can give a much better, totally qualified statement and explanation about this? I hope so!
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