What is a billing address?   
The billing address is where the credit/debit card you are using to make payment with, is registered.

You do not have to have your gift delivered to your billing address.
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How long will it take for my voucher to arrive
My gift is not a voucher how long will it take to arrive
What will I receive with my voucher
Will my gift fit through my letterbox?
My billing address is different to my delivery address, will this affect delivery?
Can I send my gift abroad?