It depends on your individual circumstances as often the debt is heavily weighted in one direction but the other partner is the bigger earner. One partner may be insolvent and the other not. Speak to an IP who can give proper advice for what are the best options.
Ours are totally seperate, even though some of the loans were joint. We make two seperate payments per month.
Sharing from experiences of dealing with debt
The greatness of a man is not in how much wealth he acquires, but in his integrity and his ability to affect those around him positively.
Bob Marley. http://kallis3.blogs.iva.co.uk
If one partner is insolvent and the other is not, then the non-insolvent partner would not qualify for an IVA.
I think it is fair to say that the majority of couples, who are in debt, would propose their cases on a mutual and interlocking basis, generally due to affordability, however if the opportunity does arise - and this will increase with the relaxation of hurdle rates previously imposed by creditors - then we may see more completely "individual" arrangements.