How were Crown Colony cruiser torpedo tubes intended to be used?

How were the torpedo tubes used on Crown Colony-class cruisers?

The tubes could be swung out to attack larger surface ships, following the same intended use as the Town class.

The torpedo tubes could be swung out to attack ships larger than the cruiser. Their intended use was the same as on the Town class. They gave a Crown Colony cruiser another weapon when facing a more powerful surface opponent.