The Ordnance Survey map was provided by OS Openspace.
The 18th C. roads are highlighted in semi-transparent blue and the effect is that of a rather thick highlighting pen, which becomes less obtrusive as the map is enlarged.
In addition to the panning and enlargement tools on the top of the screen the map may be re-centred by ‘dragging’ with a right-clicked mouse. It may be enlarged by double-clicking.
A major trunk road only map is also provided as it could be difficult to distinguish trunk roads on the very detailed map.
Grid references are expressed in all-numeric format