Apparently,the Bill of Lading would specify what goods are actually in the packages and what quantity,and the customs inspector will ensure it is true,there is no responsibility for the purposes of issuing a Bill of Lading that to opened and saw what product was inside and how many number.
Only provided the terms and conditions of the Letter of Credit have been fully complied with, and after receipt of the documents, the Issuing bank shall effect payment.
Any Uk banks can provide Letters of Credit, but the Applicant(your) must be pay the some deposits to the bank,the charge is thousandths of the Credit amount.
The Bill of Lading sample:
