The orb and the crossed swords are from the arms of Willesden; the orb represents King Athelstan, who granted the Manors of Neasden-cum-Willesden to the Monastery of St. Arkenwold in the 10th century, while the swords represent the Dean and Chapter of St. Paul's, who were the owners of the Manor of Willesden at the time of Domesday.

The supporters are also taken one from each of the arms of the former Boroughs, the lion from Wembley and the dragon from Willesden.

The gold lion comes from the arms of John Lyon, founder of a trust for the maintenance of Harrow and Edgware Roads, which partly lie within the Borough.

The green flag held by the lion bears gold scales, which indicate that the Hundred Moot (court of law) of Gore was held at Wembley.

The remaining one of these holds a red flag with three silver lilies, the emblem of St. Mary, the patron saint of Willesden.