Hi Gerald,
Thank you for this information. I have looked at the map and it looks like the drop can be anything from 22.1m to 32.1m. I will send an email to Alan Dawson and see if can I find out the accurate height of the col. Alan Dawson has been helpful with a few queries I had about some Marilyns when I first became G - Association Manager 6 years ago.
Jimmy M0HGY