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This is speculative on the part of LBS. No commercial affiliation beyond the East India Co. is shown for George Johnstone by either the History of Parliament or Emma Rothschild, Inner Lives of Empire.
March 15 1774 The partnership between George Johnston and John Rae of St Martin Le Grand merchants is dissolved by mutual consent, debts due to and owing from the firm to be paid by John Rae, George Johnston intending to retire.
London Gazette 11440 15/03/1774 p. 3