Make Celtic and Boudicca coins
The Romans made coins. While you watch the video you will see the head of Roman Emperor Claudius on such a coin.
Suppose the Celts and, later, Boudicca, had made coins of their own. What would they look like?
Cut out a cardboard disc to represent a coin. It will need to be bigger than a real coin so you can draw on it easily.
Now draw a head on one side and something else on the other. On Boudicca's coin you will need to draw her head, but as we don't know what Celtic kings looked like you will have to be more imaginative for them.
You can put anything on the other side, but you must be able to say why the Celts or Boudicca would have approved of what you have done.