Temporary Permission granted after enforcement notice - Public forum - Planning Advisory Service (PAS)

We have a site which is used as a buiders yard. Way back in the mists of time an enforcement notice was served to cease the use for that purpose and an appeal dismissed subject to minor variations. Two years after the notice took effect a temporary permission was granted to use the land for storage of building materials and site compound for a period of two years in connection with an estate to be built on adjacent land. There was a condition on the temporary permission that at the end of the temporary permission the use was to cease and the land to be returned to it's original condition. It has come to light that the site remains in use albeit on a more limited scale. The grant of permission for the same development wouild normally negate the effect of the enforcement notice. Does anybody have any ideas where there was an enforcement notice and the permission was time limited? Any comments