to expand the range of circumstances in which conditions may be attached to tree felling licences;

to enable tree felling licences to be amended by agreement;

where there is or has been a breach of a condition of a tree felling licence, to enable the Natural Resources Body for Wales to vary or remove the conditions of the licence, or to add further conditions, or to suspend or revoke the licence, and to require steps to be taken following the breach;

where tree felling in accordance with a tree felling licence is causing, or is likely to cause, significant harm to certain aspects of the environment, to enable the Natural Resources Body for Wales to amend the tree felling licence or to suspend or revoke it;

to remove the limit on fines that may be imposed for the offence of felling trees without the authority of a tree felling licence;

to make provision consequential upon the amendments referred to in paragraphs (a), (c) and (d).