21A Knockan
You can park by the forest road at NJ371457 which is followed to around NJ364457 where a short traverse N across the heather gets you to the new wind farm road. Follow this to around NJ355459 then NW across heather to the small summit cairn (the measured high point is 30m N of this). The track shown on the 50k map has been lost in the felled forest around NJ353455 but you can track around the forest edge, and the track shown on the 25k map from NJ348458 to NJ350461 is overgrown but bypassable (I returned this way).
(1 hour 15 mins, 3.5 miles, 450' of ascent)