What a privilege to supply for this iconic and historically important project!
The Cottage was built following a gift of a model of a Russian Farm to the 6th Duke of Devonshire in 1855 from the brother of Tsar Nicholas of Russia. The Tsar and the 6th Duke had become friends following the Duke's visit to Russia in 1816 when he served as the British Ambassador to Moscow. An exchange visit in 1844 was planned but unfortunately the Tsar had to cancel his visit. Instead the Duke was sent an intricate model of a Russian farmhouse as a reminder and keepsake, from which came the inspiration to build Russian Cottage. (Text from chatsworth.org)
All of the white used in this is Cambridge No 7.