Question: Who was the prime minister under which the predecessor of Derick Heathcoat Amory served?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/successor> <http://dbpedia.org/resource/Derick_Heathcoat-Amory,_1st_Viscount_Amory> . ?x <http://dbpedia.org/property/primeminister> ?uri  . }
Answer: The prime ministers of the predecessors of Derick Heathcoat-Amory, 1st Viscount Amory are [Winston Churchill, Harold Macmillan, Anthony Eden, Sir Alec Douglas-Home, Clement Attlee].