Hi there, José M. spanish atoreny
If both names are ***** ***** propiety, the problem is that you two could lose both propieties
For the comunity is easier to seize the spanish propieties and get the money from them but endeed they could seize your propieties in UK too
I think that the best for you will be to pay and seize him at court to get your money back
Contract a local atorney in Spain who deal with the comunity an agrement and pay.
Once you pay sue your colleague at court
I gently ask for a good rate of the service