Once you have a drawing open in AutoCAD, it ought to be quite simple to plot it to a known scale but actually, it can be quite complicated for the AutoCAD beginner. However, you can follow this tutorial with any other AutoCAD drawing. This tutorial assumes that you have downloaded some vector data (probably a combination of Themes from the MasterMap Topography Layer) from Digimap and that you have converted the data to the AutoCAD DWG file format using the InterpOSe translation application.
Plotting scaled drawings with AutoCAD 2011 - 2014 Introduction
