Blatant Buttress - accessing this crag is not recommended following several climbers having been removed with a warning by the Police. The crag is immediately above a live railway line which means that climbing on it involves trespass across the railway itself and this constitues a criminal offence (as opposed to trespass on non-railway land, which is in contrast a civil offence). Future access to Blatant Buttress seems very likely to result in the Police attending if seen and reported by passing trains. This could lead to a criminal conviction and it is strongly recommended to avoid accessing the crag.
Blackwell Halt - is slightly more set back from the railway line and the approach (see below) avoids having to cross the railway line so this crag shouldn't cause any access issues.
Parking and Approach
To access Blackwell Halt, park at Topley Pike and head down to the Monsal Trail, then go towards the cafe/cycle hire. Cross the bridge and turn sharp left at the cottages and follow a small path along the edge of the river and past a pump house. This leads to a tunnel under the train tracks. On leaving the tunnel, cross the fence on the left and go up some hidden stone steps. From here a path leads up into the grassy field below the quarry.