All the Spanish branches were closed in 1923-4 due to deteriorating economic conditions in Spain and discrimination against foreign banks.

Control of the remaining branches was exercised from London, although between 1940 and 1944 contact with them was lost due to the German occupation.

[1] Westminster Foreign Bank was granted a limited deposit licence in 1961, enabling it to start trading in the Eurodollar market.

[2] The London branch of International Westminster Bank, at 41 Threadneedle Street, continued to handle the back office settlements for the World Money Centre.

In 1982, much of the London branch was relocated to NatWest's Drapers Gardens tower in nearby Throgmorton Avenue.

The branch moved to its final location at the Kings Cross House tower block, 200 Pentonville Road, in the mid-1980s.

In 1973, National Westminster Bank acquired a minority interest in the Dutch firm F. van Lanschot, Bankiers.