A Marcus and Rebecca Marks arrived from Montreal on R.M.S. Ivernia at Greenock, Scotland on 28 July 1960 for a 5 week visit. He was described as a sportswear op., she as a housewife. What look like dates of birth were recorded, 3 June 1901 for him, 31 December 1901 for her. The address in the UK given for their visit was 50 Hardwick St. Prescott St. Liverpool. (BTW, they returned on the Carinthia on 7 September, her DOB was now given as 31 February 1901, he was described as a sportswear operator, and the visit address was 50 Hardwick St. Off Prescott St. Liverpool).
This may be the couple posted by Sandra, do the dates of birth / address do anything for you?