I did a recce here with someone who had done a sub 19h BGR and he went via the corpse road but he is a fast runner, I prefer the scree run, its less tiring for me as I'm not a fast runner, just let gravity do its work
My prefered route when you get to the fence is to turn right, then when you can follow a faint path down to Lingmell gill and follow the main path back to Brackenclose.
Bill