P1(4c) follows the arête at the foot of Forest Wall above Acorn Buttress. If you just want to get up to Forest Ledge you can scramble up on the left of this to the niche. Belay in the niche.
P2(4a) goes up the slab to the forest. Delicate step across the gap moving left, then straight up to trees with in-situ abseil tat.
P3 is a walk/scramble up through the trees to Forest Ledge.
P4(4a) trends diagonally right up Forest Wall finishing on a big ledge. Start at foot of Lethe crack and follow three steps bringing you out right and out of sight.
P5(4b) starts with the infamous mantle-shelf and continues with sustained interest to the top.