Eyup Mr C, getting up the hill from that end sounds quite troublesome. I'd not want to try it in poor conditions.
I vaguely recall that there was a problem a while back with people parking 4x4s down at the obvious spot, and also driving them up the track to Blawearie, it's possible you may have been there then. Last couple of times, I've taken the route up through the trees, up the steep bit, but I remember Jan showed a bunch of us that it's much easier to get up there by following the Blawearie track for a bit longer, then cutting up the gentler slope just before you get to the old quarry.
I honestly can't remember exactly where the path leads off from the Blawearie track to get up into the trees. It's not all that far up, more or less as soon as you get parallel with the trees.