The two direct ascents (Pigott's and Bell's routes) up the front of the Great Tower are both graded Very Difficult so these are typically avoided by taking the Eastern Traverse, a high ledge traversing to the left and through a flake tunnel before climbing "tricky short walls" (p106) directly up the side of the tower to a small cairn at the top.
The two direct routes (Pigott's and Bell's) up the front of the Great Tower are challenging, so climbers typically opt for the Eastern Traverse instead. This route involves traversing along a high ledge, passing through a flake tunnel, before climbing "tricky short walls" to reach a small cairn at the summit.