▁compiled . ▁Although ▁there ▁is ▁techn ically ▁a ▁separate ▁list ▁for ▁each ▁authority , ▁it ▁is ▁common ▁to ▁refer ▁to ▁the ▁aggregate ▁of ▁the ▁lists ▁as , ▁for ▁example , ▁the ▁ 1 9 9 0 ▁R ating ▁List . ▁R ating ▁lists ▁are ▁maintained ▁during ▁their ▁lifetime ▁to ▁reflect ▁changes ▁in ▁properties , ▁and ▁new ▁lists ▁are ▁compiled ▁every ▁five ▁years . ▁The ▁current ▁list ▁came ▁into ▁force ▁on ▁ 1 ▁April ▁ 2 0 1 7 . ▁As ▁well ▁as ▁local ▁lists , ▁there ▁are ▁a ▁small ▁number ▁of ▁central ▁rating ▁lists , ▁used ▁to ▁assess ▁properties ▁that ▁would ▁otherwise ▁span ▁multiple ▁lists , ▁such ▁as ▁railway ▁or ▁tele phone ▁networks . ▁A ▁rating ▁list ▁is ▁required ▁to ▁identify ▁each ▁relevant ▁non - dom estic ▁property ▁in ▁the ▁area , ▁and ▁assign ▁a ▁rate able ▁value , ▁based ▁on ▁a ▁r ental ▁valu ation ▁of ▁the ▁property . ▁Some ▁types ▁of ▁property , ▁such ▁as ▁public ▁util ities , ▁are ▁val ued ▁using ▁a ▁stat ut ory ▁formula ▁instead . ▁The ▁task ▁of ▁compiling ▁and ▁maintain ing ▁the ▁list ▁is ▁given ▁to ▁the ▁valu ation ▁officer ▁for ▁each ▁authority , ▁who ▁is ▁a ▁civil ▁servant ▁of ▁the ▁Val u ation ▁Office ▁Agency , ▁an ▁Executive ▁Agency ▁of ▁Her ▁Majesty ' s ▁Re venue ▁and ▁Custom s . ▁ ▁R ate able ▁value ▁ ▁R ate able ▁value ▁is ▁an ▁estimate ▁of ▁the ▁annual ▁rent ▁that ▁would ▁be ▁paid ▁for ▁the ▁property ▁at ▁a ▁fixed ▁date . ▁Currently , ▁this ▁date ▁is