Sorry, I didn't mean the mortgage, I meant the house ownership. Not sure exactly what its called in UK, but do a Title search to see if your and the W's name are on the title/deed as registered owners. If so, you'll need to sign and agree to any house sale Contract etc. If not, she could do things without you knowing. See a lawyer to check
With your agreement, is this legally binding in a consent order or whatever you call it in the UK? If not, you may wish to do so to protect yourself. Again, see a lawyer asap.
Me: early 40's XW: nearly 50 T: 15 M: 5 BD: Jan 19 S:10 SS: 22 SD: 24