what would be a good way to do this on a once off basis?
For an amount under £1000

borrow substantial amount of money to finance the export of both labor and materials of the company. The export working capital can also be used as payment guarantee or performance bond even in credit card application forms. The SBA and the U.S. Export Assistance Center are the public offices that handle EWCP loan applications.
The main purpose of EWCP is to help all small business in the United State that are interested on investing both first time homes and resources in the export industry. Small loans can eaisly be gained.