Hmmm....
....this does of course beg the question of how Chopper got his?
Particularly in light of this:
"Some things we can't deliver
Parcelforce Worldwide complies with strict transport regulations. We will not carry certain goods and substances. Please check our guidelines on prohibited goods before you arrange despatch.
To comply with strict regulations Parcelforce Worldwide does not carry any substances classified as dangerous in the latest edition of the Civil Aviation Organisation's Technical Instructions.
There are nine hazard classes which cover these and the examples quoted below must not be taken as full lists of all dangerous goods. We will not accept other materials and products that may be hazardous to our handling staff.
Dangerous goods are defined as those goods which meet the criteria of one or more of the nine UN hazard classes. These classes relate to the type of hazard and are detailed below. All dangerous goods are prohibited.
Class Four: Flammable Solids Definition: Solid materials which are liable to cause fire by friction, absorption of water, spontaneous chemical changes, or retained heat from manufacturing or processing, or which can be readily ignited and burn vigorously. Examples: Matches (any type inc. safety); Calcium Carbide; Cellulose Nitrate products; Metallic Magnesium; Nitro-cellulose based film; Phosphorous; Potassium; Sodium; Sodium Hydride; Zinc Powder; Zirconium Hydride, etc. "
http://www.parcelforce.com/portal/pw/content1?mediaId=2600031&catId=2500038