On the sharp bend (look for the white chevrons traffic sign) take the lane to your left, its entrance marked by a pair of granite posts . This is Piggy Lane, also referred to as Trewartha Lane or Warra Lane. This goes down to Trewartha Farm, a former tenement of the Manor of Mithian. Cornwall County Council Monuments Record states that it was first recorded in 1550 and the name is Cornish from "tre" and "guartha" meaning upper farmstead.
Continue down the lane, turn left at the bottom, and you are back in Mithian F. The walk takes a leisurely 45 minutes, just sufficient to justify a pub lunch.
Any direct quotations from "Mithian" are with the kind permission of the author, Tony Mansell.