Local authorities in Wales have spent more than £56 million on external consultancy fees in recent years.
Isle of Anglesey council spent £9.8m in three years between 2013 and 2016, while Vale of Glamorgan spent just £875 in the five years up to 2016.
Nine councils failed to respond to a freedom of information request by Janet Finch-Saunders AM, the shadow cabinet secretary for local government.