Question: Which Grade I listed building in Dorset, England was designed by the same designer as Blenheim Palace and Castle Howard? 
Sentence (from "Grade I listed war memorials in England"): As part of the commemorations of the centenary of the First World War, Historic England—the government body responsible for listing in England—is running a project with the aim of significantly increasing the number of war memorials on the National Heritage List for England.
Relevant evidence: No