Commentary on Sections Part 4: Additional Planning Control. Section 103: Acts causing or likely to result in damage to listed buildings
This section states that anyone carrying out unauthorised works on a listed building will be guilty of an offence.  It also states that a person who fails to prevent damage or further damage resulting from this offence is guilty of a further offence. Fines have been raised to the statutory maximum.  Also the fine payable on summary conviction when a person fails to prevent damage or further damage is raised from one tenth of a level 3 fine to one tenth of a level 5 fine on the standard scale.  Offences may also be convicted on indictment.