From M5 follow signs for Plymouth/Torquay (A38)
Remain on A38 until road divides, follow signs for Torquay and take A380 up Telegraph Hill.
At the top of the hill, take the first exit left before the over bridge follow the slip road around and past the café coming to a T junction and turn left. Follow this road to the junction and bear left down the hill. Half way down the hill turn right into Mamhead House. Go down the drive and Mamhead Castle is the first building on the right. The car park is a bit further down the drive and there are steps to bring you back to the entrance.