It is a treasure hunt (route with questions to answer) along some great greenlanes in Devon. At the end you go to the pub for a carvery.
To see more pictures there is a Facebook group called Charity Mania 4x4
I went last year and it was a great day out, nothing too challenging, (I did the hard route last year in my standard 80 on BFG A/T) but some great lanes and great views.
I was the only LC80 there last year, be good to have a few more Toyotas to show the Green Oval how to climb Simms!