Hannah Callow's scene lasts from about 50 minutes in until 1 hour 11 minutes in to the video. She enters the video editing suite of the studio and chats up the bloke doing the editing, saying she has come for a job interview. She is interested in the hard core stuff he is editing and gets turned on. He takes her onto an adjoining set where there is a bed and the sex scene follows - bj, missionary, 69, doggy, cumshot over bum.
This is Studio 7's version - there is interference at the bottom of the screen but in the Hannah scene the German overdub has been suppressed and the English dialogue brought up in volume.