Being a bit of a butcher is part of a successful soldier. So a professional surveyor was used.
What mistakes are these ?
Sadly not ideal for an archaeologist
As noted previously "It’s worth mentioning that David Field and Trevor Pearson in “Stonehenge Amesbury Survey Report pointed out that as Hawley did not provide decent co-ordinates some of the Y and Z positions in the north east are not quite right in the Cleal et al plans ."