OK i've got in touchwith Ex OH.
It appears she is actively seeking employment & has 3 interviews lined up. When I mentioned the court order, it made her rethink her position & it appears now that it will be possible for her to pay her half of the mortgage (less rent received , if we get it rented) if I give her a few weeks to get a job.
I don't have any better ideas , other than enter a legal battle which will cost the earth.
On the "savings under wraps" I had considered approaching the bank & using my savings to reduce the mortgage.
I now think I'll hold on to them. I dont know what the future will bring.