The course is based at the Horseheath Point to Point course and can be found midway between Horseheath and Linton on the A1307. The postcode of the course is CB21 4QF but CB21 4QP will probably get you closer on most sat navs
Travelling West along the A1307 from Haverhill look for the entrance to the course on the left hand side of the road about 1 mile after passing Horseheath (just after the road becomes a dual carriageway)