ing ▁to ▁run ▁the ▁race ▁to ▁the ▁International ▁Formula , ▁when ▁the ▁response ▁was ▁poor ▁the ▁event ▁was ▁post pon ed ▁and ▁changed ▁to ▁a ▁Formula ▁Lib re ▁event ▁instead . ▁The ▁new ▁date ▁meant ▁that ▁the ▁Italian ▁teams ▁were ▁unable ▁to ▁attend , ▁leaving ▁it ▁to ▁be ▁mostly ▁an ▁internal ▁French ▁affair ▁with ▁six teen ▁Bug att is , ▁two ▁Pe uge ots ▁and ▁a ▁Del age ▁among ▁the ▁twenty ▁five ▁star ters . ▁B irk in ▁did ▁not ▁race ▁No . ▁ 1 , ▁he ▁rac ed ▁the ▁second ▁road ▁race - prep ared ▁super charg ed ▁ 4 . 5 ., ▁registered ▁U R ▁ 6 5 7 1 . ▁ ▁The ▁race ▁distance ▁was ▁twenty ▁five ▁la ps ▁of ▁the ▁ ▁track , ▁making ▁a ▁total ▁of ▁. ▁Philippe ▁Ét an cel in ▁n urs ed ▁his ▁Bug atti ▁Type ▁ 3 5 ▁home ▁with ▁a ▁ 2 . 5 ▁minute ▁lead ▁to ▁take ▁victory , ▁B irk in ▁was ▁next , ▁ 1 4 ▁seconds ▁behind , ▁and ▁Z anel li ▁third . ▁▁ 1 9 3 1 ▁Bent ley ▁Mot ors ▁with d rew ▁from ▁racing ▁in ▁ 1 9 3 0 , ▁and ▁closed ▁down ▁the ▁following ▁year . ▁It ▁was ▁purchased ▁by ▁Roll s - Ro y ce ▁Limited ▁in ▁ 1 9 3 1 , ▁which ▁ ▁did ▁not ▁author ise ▁racing ▁for ▁a ▁few ▁more . ▁Dor othy ▁P aget ▁with d rew ▁her ▁support ▁for ▁B irk in ' s ▁racing ▁team