Custom Charge

Hi

I ordered a custom configured MBA. As it ships from China, im quite anxious that I will be hit with a high custom charge. For reference, I live in the United Kingdom, and the package has currently shipped from Chengdu to: Hong Kong, Dubai and now heading of to Cologne (Germany)

If i have to pay a custom charge, can Apple not reimburse me? Will i receive a receipt?

Thanks

A