query: SELECT ?item ?constituency ?party ?votes ?election
  WHERE 
  {
    {
      ?election wdt:P361 wd:Q22001091 . 
      ?item p:P3602 ?ps .
      ?ps ps:P3602 ?election .
      ?election p:P541 ?office .
      ?office pq:P768 ?constituency .
      OPTIONAL { ?ps pq:P1268 ?party . }
      OPTIONAL { ?ps pq:P1111 ?votes . }
    } UNION {
      VALUES ?election  {wd:Q22001091 }
      ?item p:P3602 ?ps .
      ?ps ps:P3602 ?election .
      OPTIONAL { ?ps pq:P1268 ?party . }
      OPTIONAL { ?ps pq:P768 ?constituency . }
      OPTIONAL { ?ps pq:P1111 ?votes . }
    }
  }