Duty of care applies to everyone handling trade waste, which includes commercial shoots. If you break the duty you are liable to an unlimited fine.
Duty of care means that you have to take all reasonable steps to keep the waste safe. For example safe storage of spent cartridges might be in large bins or a skip. Duty of care also means that the waste must be properly disposed of. That means contacting a company authorised to dispose of it properly.
The easiest way to do this is by entering into a contract with the local authority to take the waste away. You can also give it to a registered waste carrier. There are a few companies who offer this service, for which there is a charge including Agricycle www.agri-cycle.uk.com and Solway Recycling Ltd www.solwayrecycling.co.uk. For further information contact them directly. It is the responsibility of the waste producer to check that their chosen recycling organisation is registered.
In addition waste producers need to sign a waste transfer notice, saying what the waste is and how it is stored.