▁his ▁acting ▁debut ▁playing ▁Mike ▁Pr eston ▁alongside ▁Carol ▁White ▁in ▁the ▁John ▁Mack en zie ▁film ▁Made . ▁The ▁film ▁was ▁chosen ▁( al ong ▁with ▁A ▁C lock work ▁Orange ) ▁to ▁represent ▁Britain ▁at ▁the ▁Ven ice ▁Film ▁Festival . ▁Har per ▁also ▁recorded ▁the ▁sound track ▁for ▁the ▁film , ▁released ▁the ▁following ▁year ▁as ▁L if em ask . ▁At ▁the ▁time , ▁L if em ask ▁was ▁created ▁as ▁Har per ' s ▁final ▁bow , ▁as ▁he ▁had ▁been ▁diagn osed ▁with ▁the ▁( then ) ▁little - known ▁gen etic ▁condition ▁H HT , ▁which ▁caused ▁poly cy th emia , ▁in cap ac it ating ▁him . ▁The ▁cover ▁art ▁shows ▁Har per ' s ▁life ▁mask , ▁as ▁opposed ▁to ▁the ▁' de ath ▁mask ' ▁it ▁might ▁have ▁been . ▁ ▁After ▁recover ing ▁( tre at ment ▁involved ▁frequent ▁ven ese ction ), ▁his ▁next ▁album ▁( Val ent ine ) ▁was ▁released ▁on ▁Valent ine ' s ▁Day , ▁ 1 4 ▁February ▁ 1 9 7 4 , ▁and ▁featured ▁contributions ▁from ▁Jimmy ▁Page . ▁A ▁concert ▁to ▁mark ▁its ▁release ▁was ▁held ▁on ▁the ▁same ▁day ▁at ▁London ' s ▁Rain bow ▁Theatre , ▁with ▁Led ▁Ze ppel in ' s ▁Jimmy ▁Page , ▁Robert ▁Plant , ▁and ▁John ▁Bon ham ; ▁David ▁Bed ford , ▁Max ▁Middle ton , ▁Ron nie ▁Lane , ▁and ▁Keith ▁Moon ▁performing ▁alongside ▁Har per . ▁His ▁first ▁live ▁album ▁Flash es