The last major set of calculations left to do was working out the scale from A1 map to real life, and applying it to the distances previously measured.
As 40cm on the map = 700m in real life
700 / 40 = 17.5
DISTANCE IN REAL LIFE SCALE
1cm on A1 map = 17.5m in real life
DISTANCE IN REAL LIFE BETWEEN COORDINATES
Distance on A1 map (cm) x 17.5 (scale above)
That one is pretty obvious I know, but I'm getting a tad OCD with documenting everything these days.