Can anybody please help identify a 70s movie

My dad had this video way back when, the guy in the photo was paying couples to let him watch them have sex. His chauffer would drive him around to the meets but as he got excited he would fall asleep so they start filming the sessions for him to watch later. Eventually the chauffer fucks his wife. I THINK the version my dad had was typical UK soft porn, but I'd like to find a hardcore version of one exists. Thank you ????