I know there's been some talk about import duty so hopefully the following link will assist in this.
Whenever an item is imported/exported, it requires a commodity code (aka Tariff Heading). Having these clearly identifiable on the box can improve the speed of the delivery and also make sure the correct amout of duty is paid.
The following link is for cycle items (EU only)
http://www.uktradeinfo.com/index.cfm'task=icncomcode&Heading=8714&strmatch=cycleAlternatively you can call 0845 0109000
Once I've found a decent international list I'll update the thread.
Might be worth sticking this.