If you (or your ex)have received a statutory demand you need expert help and you should contact Ahmed Butt as addvised.(posted 7584 days ago)If you are being threatened with a statutory demand by letter...it might just be scare tactics.
I dont think it will do any harm to SARN all the concerned parties right away and I will e mail a copy of a sarn letter which you should send by recorded delivery.
The advice re keeping everything separate sounds very wise...you must do everything you can to make you appear asset - less! Remember your partner has no part of this so you need not reveal anything about his personal assets etc.
Do not acknowlege the debt in any way and/or admit any liability if they contact you. It would be fair to tell your ex the same.
Let us know how you get on!
Good Luck
Moira