If you are travelling by road from anywhere outside of Devon and heading to the west of Cornwall, the most direct route is likely to include the M5 and then the A30.
Directions From Helston:
From Helston, head south on the A3083 following the signs for the Lizard.
Follow the A3083 for approximately 9 miles passing the Mullion turning and the Lizard Cider Barn on your right. Continue towards the Lizard for another half mile and then take the next left hand turning signposted for Cadgwith (black "heavy vehicles" sign).
Follow this road for just under a mile towards Chyheira on your left at which point the road bends sharply to the left, continue to the left for half a mile then take the right hand turning through two granite pillars towards the Cove. As you reach the Cove, you will pass the Watch House shop on the left and next to it, the Gig Shed. Immediately after the Gig Shed turn left into a cobbled lane, drive past Rose Cottage and through the wooden gates into The Square, Pebbles has an alocated parking space next to the cottage.