Sounds like a good yarn to me or a "Dan Dare" adventure for anyone with experience of cross channel ferries you would be very very lucky working into a three hour window over that distance..
Agree except in an interview with Norman Dewis he said he was asked to drive to Geneva straight from work without prior warning after a phone call from William Lyons. The 10 minutes to spare is the part that may not be entirely accurate but he did also say he then had to do a full day testing with the press without having had any sleep!
you would be very very lucky working into a three hour window over that distance..