Court order for costs (Divorce)

Hi

can anybody tell me what the procedure is



a court order issued (costs agreed with both parties) for divorce costs (£1500 + cost of the order £50)



what happens now if the other party wants to pay say £50 a month, they are already paying the £15k from the divorce settlement over 5 years



can the person that is owed the money force them to come up with the £1500? how do you enforce the court order



the court order said to be paid "forthwith"



issued 10/10/14 and refers back to order made on 10/4/14



any help appreciated



thanks

Court order for costs (Divorce)