If, after the service of an enforcement notice, planning permission is granted for the retention on land of buildings or works, or for the continuance of a use of land, to which the enforcement notice relates, the enforcement notice shall cease to have effect in so far as it requires steps to be taken for the demolition or alteration of those buildings or works, or the discontinuance of that use, as the case may be.
If the planning permission granted as mentioned in sub section (1) of this section is granted so as to permit the retention of buildings or works, or the continuance of a use of land, without complying with some condition subject to which a previous planning permission was granted, the enforcement notice shall cease to have effect in so far as it requires steps to be taken for complying with that condition.
The preceding provisions of this section shall be without prejudice to the liability of any person for an offence in respect of a failure to comply with the enforcement notice before the relevant provision of the enforcement notice ceased to have effect.