Today I rode the perm Down to Downs, still a good ride, followed the track from the calendar event a few years ago. Heading north from Edenbridge where you turn right there is a road closed sign: after a few hundred yards there are vans and barriers and a hole in the road, but there is a one foot wide gap on the left (ie on the northern side of that road) and you can get a bike through that. I rode with someone else and we passed Liev (NOTP) who was riding it in the opposite direction.
one perm: three riders. prob not a record. but a sign of its popularity.