in reply to calculate distance in miles using Easting Northing coordinates.

It appears you can use Geo::Coordinates::OSGB for the conversion and Geo::Distance to calculate distance in miles.

As igelkott points out - A search for easting on CPAN will return Geo::Coordinates::OSGB as the first item. Geo::Distance I have used in the past and it works well.

One dead unjugged rabbit fish later...