Not sure my back would cope too well nowaday's.
I've done the one at Bedgebury but it was 9 years ago when it was first installed. Was great fun and a little hairy in places as it used to be one of the highest (I've noticed they have dropped down some of the zips a level or so, since).
My get out this time is I'm in the Lake District from 6th
. Maybe next time if you want to try Bedgebury.