Opponents claim that building a road so close to a site of special scientific interest will damage ancient woodland housing protected species including dormice and bitterns.
The charity said dormice remain above ground level and live and travel in hedgerows and trees, so more linked wooded sites are needed to encourage movement and breeding.
And all that attention to detail has included building elevated road crossings for the endangered dormice who live on the course, and tunnels under the holes to the River Usk to protect the native toad population.