This is something I tried to do when I was owed �37.000. I even had it in writing from the guy involved. I went thru a solicitor as advised due to amount involved and got a judgement against him but the charge on his propertytwas turned down due to it being :a personal debt ' . His house was sold and then he did a runner ,surprise, !!five years on and I am still trying to find a solution. I found the local county court helpful, but you can try money claim online only not sure if it can be done due to large amount involved. Good luck.