Back when I started my website in the early 2000s I assumed that the distribution between clockwise and anti-clockwise was roughly equal and that each year was the same. There were no statistics to state otherwise, the Club didn't even have a website at that time and everything was paper based so actually collating such data was more work than my predecessor, Brian Covell, would have wished to take on.
In the initial stages of digitising the old paper records I rather conceitedly thought that the switch from mostly Anti-clockwise to clockwise had occurred at least in part due to my personal website basically being "How to do the BG clockwise". It was only when I'd got all the data and then written code to analyse it that it became apparent that this wasn't the case.
If you go to
http://bobgrahamclub.org.uk/index.ph...s#record_lists and select "General Info" from the first drop down and "Rounds by Year" from the second you will get a breakdown of each year. It's obvious that the switch happened around 1990/1991 for the men and a decade or so later for the women. I haven't seen anything anywhere to suggest why this happened.
So far this year there's just 3 out of 132 registrations who've elected to go anti-clockwise. I took on the membership secretary role in 2012 so I've not data on how many registered for either direction before that time.
Ultimately you've the same distance and the same elevation gain whichever direction you choose. However, from the same link above, choose "Individual Records" and "The overall Fastest times" and you'll see that there's only two anti-clockwise rounds listed with Steve Birkinshaw being the fastest at 17:09. It's a similar case for the women with Ros Coates' 20:31 being the fastest women's anti-clockwise round. But a quick scan shows that Steve's 17:09 was the fifth fastest ever at the time, all those other fast clockwise rounds have been done since, and Ros Coates' time was the ladies' record which she held for another nine years.