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Searching on “United Kingdom”, I found a “Protocol amending tax convention with the Netherlands“. This is a

message from the President of the United States transmitting protocol amending the convention between the United States of America and the Kingdom of the Netherlands for the avoidance of double taxation and the prevention of fiscal evasion with respect to taxes on income (including exchange of notes with attached understanding)

The language of the message is a little archaic (although the UK Parliament is hardly a shining example of modern language):

To the Senate of the United States:

I transmit herewith for Senate advice and consent to ratification, the Protocol Amending the Convention Between the United States of America and the Kingdom of the Netherlands for the Avoidance of Double Taxation and the Prevention of Fiscal Evasion with Respect to Taxes on Income, signed at Washington, DC., on March 8, 2004. Transmitted for the Senate’s information is an exchange of notes with an attached Understanding, which provides clarification with respect to the application of the Convention, as amended, in specific cases. Also transmitted for the information of the Senate is the report of the Department of State with respect to the Protocol.

[…]

I recommend that the Senate give early and favorable consideration to this Protocol, and that the Senate give its advice and consent to ratification.

GEORGE W. BUSH.