You will find this interesting:
The house is in joint names but the debt is in my name
If the debt is in your sole name, but you own the house in joint names with someone else, they have the right to tell the court all the circumstances and why they would suffer hardship if a charging order is made. They should have been sent a copy of the interim charging order and given an opportunity to go to the hearing to put their points. For example:
* Who paid for the deposit to buy the home?
* Who has made the mortgage payments since?
* If there are children at home, ask the court to put a condition that the house cannot be sold by the creditor until the children have grown up.
* The co-owner will need to file and serve written evidence of their objections at least 7 days before the hearing.
If a charging order is made by the court, then it will only apply to your share of the property.
http://www.insolvencyhelpline.co.uk/debt_facts heets/charging_orders_in_the_county_court.php# 5