Ey up KK!
This 'ere 'enclosure' is best approached by going up the Parks Lane footpath. When y' get to the point where the Dryas Dike stream meets the track, keep going another 100yards till y' get to the gate on y' right. Go thru it and take the left footpath upwards (north), heading towards the Shooting Hut in the lovely little valley of Loftshaw Gill, but before y' reach it - about 150 yards before - cross the stream to your right and go up the slope. I think the best guide for this crossing point is the fence you'll meet . Once at the top of the slope there's a nice-looking mini-standing stone: if y' see this you're only yards from it. Walk directly east (slightly downhill) for 20-30 yards. You're there! If you're planning on visiting it, lemme know cos me & Richard Stroud are gonna be up there again pretty soon, cup&ring hunting - though it's likely gonna be a weekday - and we could show you where it is. We could meet you in Ilkley or summat...