ens ' ▁Rights ▁and ▁Constitution al ▁Affairs ▁has ▁stated ▁that ▁a ▁hypoth et ical ▁right ▁of ▁rev ocation ▁can ▁only ▁be ▁exam ined ▁and ▁confirmed ▁or ▁inf ir med ▁by ▁the ▁EU ▁institution ▁compet ent ▁to ▁this ▁purpose , ▁namely ▁the ▁C J E U . ▁In ▁addition ▁the ▁European ▁Commission ▁cons iders ▁that ▁Article ▁ 5 0 ▁does ▁not ▁provide ▁for ▁the ▁un il ater al ▁withdraw al ▁of ▁the ▁notification . ▁Lord ▁K err , ▁the ▁British ▁author ▁of ▁Article ▁ 5 0 , ▁also ▁cons iders ▁the ▁process ▁is ▁revers ible ▁ ▁as ▁does ▁J ens ▁Dam mann . ▁Professor ▁Stephen ▁We ather ill ▁disag rees . ▁Form er ▁Bre x it ▁Secretary ▁David ▁Davis ▁has ▁stated ▁that ▁the ▁British ▁Government ▁" does ▁not ▁know ▁for ▁sure " ▁whether ▁Article ▁ 5 0 ▁is ▁rev oc able ; ▁the ▁British ▁prime ▁minister ▁[ then ▁Ther esa ▁May ] ▁" does ▁not ▁intend " ▁to ▁reverse ▁it . ▁ ▁Ext ension ▁of ▁the ▁two ▁years ▁time ▁from ▁notification ▁to ▁exit ▁from ▁the ▁union , ▁still ▁requires ▁un anim ous ▁support ▁from ▁all ▁member ▁countries , ▁that ▁is ▁clearly ▁stated ▁in ▁Article ▁ 5 0 ( 3 ). ▁ ▁Should ▁a ▁former ▁member ▁state ▁seek ▁to ▁re join ▁the ▁European ▁Union ▁after ▁having ▁actually ▁left , ▁it ▁would ▁be ▁subject ▁to ▁the ▁same ▁conditions ▁as ▁any ▁other ▁applic ant ▁country ▁and ▁need ▁to ▁negoti ate ▁a ▁Tre aty ▁of ▁Acc ession , ▁rat ified ▁by ▁every ▁Member ▁State . ▁ ▁Out erm