To get there I’ve been advised to avoid the centre of Warminster.  These directions are complicated, so are best read with the map link above…

So, turn left at the roundabout where the A36 turns to become the Warminster by pass and instead head towards Upton Scudamore on the A350.  Take the first right onto Westbury Road (there is a turn right lane I think).  Where this road turns 90 degres to the right, turn left (i.e. go straight on!) into Copheap lane and follow to the end.  Here turn right at the mini roundabout, and then left almost immediately at a second one and you will be in Woodcock Lane. The ground is then on the right.