
In my experience of importing bits and pieces from the states, it's whether the vendor 'remembers' to write up the customs label correctly that determines whether HM Customs (actually parcelforce, or Post Office do the work, and charge the admin fee) pick it up and wipe out your margin.
I have imported many items in the past year, and only one supplier so far has filled in the customs label accurately.
Bikesmart.
It's definitely worth discovering who'll be slack and lazy with the paperwork, as it could save you quite a few quid!
So, jensonusa.com, you say........
Nice!