As a real lawyer, I can tell the OP now that there's no useful, contextual advice that anyone can give you online in the absence of a serious investigation of you and your soon-to-be ex's circumstances. Issues of economic disparity (if that indeed arises at all) under s 15 of the Property (Relationships) Act can be massively complex. Talk to a proper specialist and not just a general practice lawyer. A couple of hours of advice shouldn't cost more than 1K. It's worth it for both of you, especially since you appear to want to approach this sensibly and amicably.