Quick video that shows you how to combine the Topography file with the Contour info - use the base drawing I have prepped here - you then insert the mastermap files in and the scale and co-ordination with the contours is automatic:
https://drive.google.com/file/d/1pMcZ...
This file was updated late 2020 as the Ordnance Survey very kindly changed the majority of the layer names, so the file includes pre 2020 layer names too. Once you have the drawing colour scheme converted use the PURGE command in AutoCAD to dump all the layers that are not needed. good for downsizing drawing and getting rid of unused blocks too.
Follow the video carefully - there's a lot of tricky steps. regards \m/ .