With no major assets (assuming the cars are not mercs etc) you may also wish to give consideration to bankruptcy. You may have to contribute to the debts for a period of 3 years, but then again, depending on how much you need to live reasonably, you may be asked to contribute little or nothing over that period.
This is, of course, a personal decision for you both, some people would rather take the IVA route as they feel it is more ethical then bankruptcy but you need to take specialist advice so I will echo suzanne100268 and encourage you to visit
www.iva.com and have a look round, read the reviews and suggest you speak to 2 or 3 people before you make your final decision. Make sure that ALL the options are explained clearly to you, any reputable IP firm will be happy to do so without obligation.
Regards.