That long part at the front is a skirt, not a plinth; there are rods at the back, which I guess correspond to legs.
For context, this is where the statue is sited, on North Station Roundabout where anyone leaving Colchester to the Northwest can't fail to see it:
I think formally the statue is called Boadicea rather than Boudicca, which I take to mean that it's a representation of the myth, rather than of the woman. Still, it's a very popular among Colcestrians (a fact missed on the man selling his nearby house, who wanted compensation because he thought the statue's presence devalued it in a way that being next to the most complicated roundabout in Britain didn't).