Alison: you need to see a solicitor and talk through all these options. Including what to do if he gets all arsey about it. It sounds like you're not in any hurry to actually D, just to sort out the financial side, so if he does choose to go ballistic about this then that is him choosing D instead of R. You can still buy him out of the house and leave the door open to a future R, if you decide that's what you want. But best to get things sorted financially, for sure.