Quote Hendy Charming="Hendy Charming"Whats the significance of the crest design. I can work out the King, but what about the castle and the lions?'"
From Wikipedia (I am assuming that common imagery in this and the Ancient and Loyal crest will have similar origins ie castle and lions)
Arms of Wigan Metropolitan Borough Council
The field of the arms consists of alternating gold and black lozenges or diamond shapes. Black lozenges are extensively used in British civic heraldry to symbolise coal mining, while each gold lozenge bears a red rose of Lancaster to represent the union of several Lancashire communities in the metropolitan borough. The chief or top section of the shield displays a couchant lion from the crest of the county borough.
On top of the helm is the crest which consists of a crowned castle and mountain ash tree. The castle and crown were in the county borough arms. The tree is included as a reference to the borough's name: the local name for the mountain ash being "Wiggin Tree".
The supporters are a gold crowned lion from the county borough arms, and a sparrowhawk from the arms of the Atherton family, and found in the devices of Atherton Urban District council and the Borough of Leigh.