In reply to The Connor-Crabb:
Not a grid reference, but.....
You park here:
https://maps.app.goo.gl/MuJoCRKrRcZzcxW96
I seem to remember there's a fairly obvious path heading into the woods about parallel to the field boundary to the left. You go along that, I think it becomes more faint (it isn't the path marked on Google, I don't think, because it doesn't intersect Little John's Walk that I recall), but you stick near ish to the edge of the wood. You come to some clean boulders where there's a few traverses and things ( Beckham Part II (f6A)) where the path swings right a bit. From there I don't recall as much of a path (you don't swing right) but you keep heading in the same direction as you've come from, down the hill.