The council may revoke a licence on any of the following grounds:—
(a)that there has been a breach of the conditions of the licence;
(b)that undue interference with, or inconvenience to, or risk to the safety of persons using the street, or other streets within the vicinity of the street, has been caused as a result of the busking;
(c)that nuisance has been caused as a result of the busking to occupiers of property in or in the vicinity of the street in respect of which the licence was granted.