We send all our Dangerous Goods to a shipping company, who then send them on, do we still need to be trained?

Yes – you still have to give them information, perhaps a Safety Data Sheet, or someone in your organisation may have to classify the items. Do you pack the goods? If you produce goods that are sent by air, road, or sea you are required to be trained in at least the basic legislation and you may require more detailed training to meet your legal obligations.