need some clarification--you state the order continues until they reach the "age of 17 or cease full time secondary education"--your elder son is doing "A" levels at "college"--that is different from "secondary education" which normally means school--were he to be at school doing his A levels it would be true the payments should continue--if he left secondary school and went to college then that may be classed as further education, not secondary--u need legal advice--sorry can't be more helpful--cheers