I would have been livid!
They really should make it a requirement. You get minors in your test if you don't indicate. That said, my work is off a roundabout and the amount of people that indicate either left or right when they are going straight is probably more than the people that don't indicate at all.
when you come off a roundabout you turn left so if you needed to indicate that would be the correct way to do it.
i cant believe its not a requirement to indicate... thats just silly it is in the US lol and they have all kinds of daft rules.