query: SELECT ?item ?itemLabel ?refURL WHERE {
    ?item wdt:P31 wd:Q5 .
    ?item p:P69 ?statement .
    ?statement ps:P69 wd:Q523926 .
    ?statement prov:wasDerivedFrom ?ref .
    ?ref pr:P854 ?refURL .
    FILTER (CONTAINS(str(?refURL),'rada.ac.uk')) . 
  
  
    SERVICE wikibase:label {
      bd:serviceParam wikibase:language "en" .
    }
  }