Spouses cannot be forced to testify against each other.
You point is well-made Tom and reveals an unfortunate by-product of otherwise well-intentioned law-making.
I'm aware of certain circumstances where spouses have provided testimony against their other half but those occurrences are pretty rare. A swift search produced the following synopsis of the situation without gobbledygook and clarifies the point in question. The piece of law is enshrined in British justice and fully complies with the European convention on human rights.
The bottom line is, as you have said, we are left with a highly unsatisfactory conclusion in this particular matter. Here's the piece:
Spouses or Civil Partners
Section 80 of the Police and Criminal Evidence Act 1984 (PACE) is the statutory provision which governs the competence and compellability of spouses and civil partners in criminal proceedings.
Spouses or civil partners of a person charged in proceedings are generally competent to give evidence for the prosecution. The only exception is if the spouse or civil partner is jointly charged. If they are, neither is competent or compellable to give evidence, on behalf of the prosecution, against the other unless the spouse or civil partner witness has already pleaded guilty, or the proceedings in respect of the spouse or civil partner witness have been discontinued.
Spouses or civil partners are competent and compellable to give evidence on behalf of the defendant or the defendant's co-accused.
The prosecution can only compel a spouse or civil partner to give evidence for the prosecution in cases which involve:
- an allegation of violence against the spouse or civil partner;
- an allegation of violence against a person who was at the material time under the age of sixteen years;
- an alleged sexual offence against a victim who was at the material time under the age of sixteen years; or
- attempting, conspiring or aiding and abetting, counselling and procuring to commit the offences in the categories above.
If a spouse witness is divorced from the defendant or the civil partnership comes to an end before he or she gives evidence, the former spouse/civil partner is competent and compellable to give evidence as if that person and the accused had never been married or had never been civil partners.
Section 80 PACE does not apply to a defendant's partner to whom he or she is neither married nor in a civil partnership.
The decision to compel a witness to attend court with a view to giving evidence for the prosecution against his or her expressed wish is one that should be exercised with sensitivity and discretion.
Tom