Hi,(posted 7675 days ago)Your sister-in-law is doing the right thing in carrying on paying the full mortgage amount as she can now take her partner to court if the house is in joint names and get him off the deeds and mortgage by proving she has paid the whole lot and he is paying nothing. She needs to see a good divorce lawyer.
As for the bills, all she needs to do is ring around the gas, electricity, telephone etc. to find out whose name is listed on the account, if it is hers she tells them that she has moved out of the property and gives them a new address and is no longer liable for these. Same applies to the council inform them she is no longer there and she will not be liable for council tax.
Going to court to get him off the property will be a long haul but it is worth it and she needs to get a full and final settlement so he can never return to claim any more from her, tell her to keep paying the mortgage but as for the rest just inform them she has left.
Good luck.