Hello Yorkins I came across this in a furniture catalogue of furniture for sale which was used by Napoleon on St Helena. 'Roman cement' also known as 'Atkinson's cement' was introduced to the London market by William Atkinson. The raw material was shipped to his own wharf at Westminster from Lord Mulgrave's estate near Whitby, the end product could be used both as an external rendering and as a form of stucco. I'll trawl through the 200 + pages and see if I come across any more mention of it Cheers Caroline