How many {island of location} are to/by {Great Britain} ?
How many islands are around Great Britain?
SELECT (COUNT(?sub) AS ?value ) { ?sub wdt:P5130 wd:Q23666 }
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/P5130> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> http://wikidata.dbpedia.org/resource/Q23666 .
} 

What is the number of islands around Great Britain?