SPARQL Help - Can't get the county for a school

Hi,I am attempting to query for all schools and their county. I cant see any easy way to get the county for a school with sparql because the address property of school doesnt have a county. I am therefore attempting to go via the administrative district to get the county.This query works ok:

prefix sch-ont:  <http://education.data.gov.uk/def/school/>

prefix rdfs:    <http://www.w3.org/2000/01/rdf-schema#>

SELECT ?school ?name ?districtAdministrative WHERE {

      ?school a sch-ont:School;

         sch-ont:establishmentName ?name;

         sch-ont:districtAdministrative ?districtAdministrative.

}

ORDER BY ?name

LIMIT 10

But the addition of the county gives me no results:

prefix sch-ont:  <http://education.data.gov.uk/def/school/>

prefix rdfs:    <http://www.w3.org/2000/01/rdf-schema#>

SELECT ?school ?name ?districtAdministrative ?county WHERE {

  ?school a sch-ont:School;

     sch-ont:establishmentName ?name;

     sch-ont:districtAdministrative ?districtAdministrative.

  ?districtAdministrative <http://statistics.data.gov.uk/def/administrative-geography/county> ?county.

}

ORDER BY ?name

LIMIT 10

If anyone could give me some pointers to why the second query doesnt return anything it would be much appreciated.