I'm a member. Nice site, although not huge. Some amusingly deep water (personally been involved with the drowning of two 90's) and fun steep climbs. Club house with coffee, jet wash, rescue ranger and loo too! Biggest downside is that you have to pay for yearly membership rather than on the day.
 
my cousin lived literally just down the road from there and we went a few years back when he was a member and still had his 109 truckcab aka the mobile skip
 
The Scottish Off Road Club usually have events at Drumclog and Lamancha, if that's any help to you.

Only been to Drumclog myself the once though and had a pretty fun weekend.
 

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