Video of John doing a few laps in his RCR-40 that weekend.
http://www.youtube.com/watch?v=tlF0J6DPkYg
Sorry for the sound quality, ended up with a terrible intermittent noise appearing in the sound track. It’s the exhaust note, changing in volume abruptly, but sounds like there is a mechanical noise from the GT40. Not there is my copy, YouTube introduced it during their processing on upload.