Did you know that advert was based on a particular scene from a 1966 film where Audrey Hepburn plays a character called Nicole? I didn’t, I just read it!
Apparently the actress playing Nicole couldn't drive and the action scenes were filmed on a car transporter!! 15a is the only clue eluding me, I'm sure it's obvious, I have crossers I and S, can anybody give me a nudge?