[2] In 1864, the Banco Nacional Ultramarino (BNU) was established in Lisbon, Portugal, as a bank of issue for all Portuguese overseas territories.

The next year, it opened branches in several places, including Angola, which at the time was an overseas province of Portugal.

Beginning in 1999, the Central Bank began implementing reforms to meet international standards.

When the bill reached the minimum values of the BNA, it was the BES London itself that warned the authorities of Angola for successive outflows of money.

Authorities in the UK froze this amount as it was a suspicious transaction and the money can now be returned to the central bank.