Nice to see your divorse is moving along.
I can only think of three legal ways to raise funds
1) borrow it. �10000 secured loan should cost a lot less than 100 per month to repay. You could consider remortgaging the flat, and see if you can get a better deal on the interst rate you currently pay. The big factor will be if you can meet the lenders requirements ie do you earn enough to service the loan.
2) work hard and save up. but I suppose you need the money quickly. You could try to negotiate terms with your ex, allowing you time to pay.
3) sell something - the car? the Van Gogh?
Here are two more ideas
You could always try the National Lottery, but someone once said that it is tax on stupidity, and the chances of winning are only slightly worse if you do not buy aticket than if you do. You coluld always pass the hat around amongst loving friends and relatives.