How many {ancestral home} are to/by {England} ?
What is the number of ancestral homes in England?
How many ancestral homes are in England?
SELECT ( COUNT ( ?o ) AS ?i ) { ?o property:ancestral_home resource:England }
SELECT (COUNT(?sub) AS ?subs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?sub .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P66> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q21 .
} 

SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P66 wd:Q21 }
4