When Workstations are designed surely the maximum theoretical limits of the workstation's control need to be known before it is built.
As
@edwin_m states below Earles seems to be in a challenging spot for lone working
Therefore to me not knowing the exact area that Sheffield workstation controls suggests to me that perhaps Sheffield needs to be split between Sheffield and Dore with the southern section given over to another workstation with this new workstation fringing Sheffield and controlling Hope Valley rather than this panel at Earles.