I work near chacewater, I'll take a drive past if I get a chance.
Going by the directions the website it's near truro tractors whose postcode is tr4 8ly google earth shows a campsite near truro tractors. There's no busy roads near there neither is there any railway. There is an old tram way near st day which runs from devoran to portreath if I remember it's a cycle way now and a nice one too running down through the old, mining area. Lands End is no where near chacewater it's about 35 to 40 miles away but truro is nearby about 5 miles maybe max. It's pretty central for Penzance, St Ives, Newquay etc etc
I never even knew there was a campsite down that road, there are others in the area for choice.