Best advice is to keep the Bank advised on what you intend doing. Let them know your financial position and that you will co-operate with a volunary repossession of the property. (effectively this means that you will co-operate in the sale of the property & should avoid any Court proceedings). When you are established in the 2nd property write to Certus and advise them that it is now your family home and that you will co-operate in paying what you can afford in line with MARP requirements.