“In some chariot burials, a form of burial reserved for those of wealth and high status, the wheels are flat, but this one was buried standing and a mound erected over the top.”
Maybe the chariot just got stuck in the mud during a battle that the Celts lost. Driven out, their enemy left the chariot stuck out in the mud as their monument to victory. (And the anomaly 9 feet down is an old log).
Probably not, at least I hope not for Mr. Smith.
The Celtic way of a victory monument was to display the severed head of the enemy. So, no. :^)