Question: Who was the prime minister under which the predecessor of Derick Heathcoat Amory served?
SPARQL query:
PREFIX prop: <http://dbpedia.org/property/>
SELECT DISTINCT ?uri WHERE { ?x prop:successor <http://dbpedia.org/resource/Derick_Heathcoat-Amory,_1st_Viscount_Amory> . ?x prop:primeminister ?uri  . }