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 take the A3083 signposted to The Lizard. After approximately 5 miles, at Cury Cross Lanes, you will see The Wheel Inn on the left hand side, just before this there is a turning on the right hand side. Take the right hand turning and continue for approximately one mile. When you reach the road junction, continue straight on for approx half mile. Take the turning on the left just before the church (Church Road). Follow the road round to the left and continue into the cul de sac of Parknoweth. Meadowside can be found at the top right corner of the cul de sac.