Kozlovsky first appears in London in early 1812, and seems to have made an immediate impression on English society. In a letter to Lady Morpeth in February 1812, Harriet Countess Granville wrote "London swarms with Russians. A fat nephew of the Princess Galitzin, a Prince something, Koslouski I believe, was going to Sardinia, but he has fallen so desperately in love with a beautiful girl, Mrs Tom Sheridan's youngest sister, that he scarcely can ...". The novelist Maria Edgeworth wrote of him in a letter to her sister: "I know nothing of him but that he is short and fat and looks good-humoured and like two men bound in one. He says he has a great desire to pay me his homage. If he throws himself at my feet he will never be able to get up again." Kozlovsky's prodigious obesity was captured in the caricature by George Cruikshank "Longitude and Latitude of St. Petersburgh". A further aspect of Kozlovski's reputation was summed up in an anonymous caricature entitled "L'aimable roué", published in 1813. Kozlovsky appears to have visited Byron on a number of occasions "complaining of the English husband and the restrictions upon their wives", but Byron's plan to return to the Mediterranean with him in the summer of 1813 came to nothing. In subsequent years Kozlovsky had friendly relations with the British King George IV. The Times records on 15 June 1829 that he had been presented to the King at a ball and a year later (The Times, 2 June 1830) he was in London again inquiring after health of the ailing King.