Thanks, The colour was called "Lavender grey," and was very attractive when the sun was shining on them. I served for 11 years in the Union-Castle Mail Steamship Co. between 1965 and 1976 when they started selling all their ships. They were a very famous line founded in 1900 by the mergence of the Union Line and the Castle Line. Very few people have ever heard of them today unless, of course, they served in them, or had some connection with them! But if you Google search for Union-Castle Line, you will find hundreds of images of these exceptinally fine looking ships.
Bob