In reply to overdrawnboy:
I realise this isn't the layby you're talking about, but just for your information..
The 'white gate' layby on the bend up towards the Grouse (the one just over the road from the NT car park) has a new path now, up the bank above it. So it's no longer necessary to walk along the side of the road to get to the gate. (Which hasn't been white for some time now.) It joins the main path just beyond the Hairpin boulder.
You can see the new path on the aerial photos on Google maps, but it doesn't exist yet on the Bing aerial photo map.