Follow the A30 into Cornwall. It's almost entirely dual carriageway until you get to "Carland Cross" roundabout (next to a wind farm).
Go straight on - staying on the A30 for ~ 7 miles until you get to "Chiverton Cross" roundabout.
Go straight on (A30) - it's dual carriageway again.
Take the first exit A3047 for Scorrier.
After 600 yards turn sharp left at a mini roundabout onto B3298.
After 500 yards turn right followind B3298. Carharrack is signposted.
Follow this road for 2 miles until you approach Carharrack village down a short hill.
At the bottom of this hill turn left at the crossroads (next to a light-up 30mph speed sign)
Chenhale Farm is on your left.
There is a double gate entrance for large vehicles just around the corner to the left.

Take the A30 east until the A3047 Scorrier exit.
Take the exit & keep turning left to cross back over the A30 and reach a T junction.
Turn right & go 500 yards to the mini roundabout as above.