Here´s a translation of the Polish text
November 19, 1839, Tuesday
Mr. Grzyboski,
Please go to the Royal Bank of Scotland and withdraw two pounds sterling, which I have deposited in your name with the local bankers, Messrs. Coutts & Co. [?].
This money, intended for you, was sent to me by Mr. Karol Sienkiewicz from Paris.
After withdrawal, please send me a receipt confirming you have received the money.
In the receipt, please state explicitly that you received the two pounds sterling sent to you through me, by Mr Sienkiewicz.
Should the banker ask who the money was sent by answer with Niedźwiedzki
Write the receipt exactly as I described above.
With best regards
Niedźwiedzki, servant