Think that could be the correct Gustav-
13 May 1936 a Gustav R. Wolff (age 22, clerk, of Dansbury House, Kew Gardens, Surrey) and Joan M. Wolff (age 23) departed Southampton on Scharnhorst for Palma De Mallorca, Spain- perhaps their honeymoon.
Added- same Gustav R. Wolff arrived 1933 at Southampton with parents Philip Robert & Marie Therete [Therese?] Angelique Irma Wolff & four siblings.