These are the conditions of a B1 visa:
Foreign visitors present in the U.S. on a B-1 visa may not be paid any salary, wage, honorarium, stipend, or other form of compensation for services rendered from a U.S. source.
Only "reasonable" reimbursement for incidental expenses-including accommodations, meals, travel expenses-may be paid. May not engage in any employment in the U.S. including salaried work or services performed on an independent basis.
From what you have stated Article 14(2) of the US/UK treaty applies, to wit:
2. Notwithstanding the provisions of paragraph 1 of this Article, remuneration derived
By a resident of a Contracting State in respect of an employment exercised in the other
Contracting State shall be taxable only in the first-mentioned State if:
a) the recipient is present in the other State for a period or periods not exceeding
In the aggregate 183 days in any twelve-month period commencing or ending in the
Taxable year or year of assessment concerned;
b) the remuneration is paid by, or on behalf of, an employer who is not a
Resident of the other State; and
c) the remuneration is not borne by a permanent establishment which the
Employer has in the other State.
Therefore, since you were present less than 183 days in 2009 and all your income derived from sources without the US (your UK employer) that income is not liable to tax in the US.
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