build_constituency_query_string("Westminster", "LAD22NM", "3D")
"%20(%20'LAD22NM%20%3D%20'Westminster')%20"
build_constituency_query_string(c("Westminster", "Tower Hamlets"), "LAD22NM", "3D")
"%20(%20'LAD22NM%20%3D%20'Westminster'%20OR%20LAD22NM%20%3D%20'Tower%20Hamlets')%20"
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