Free Digital Maps
Ordnance Survey have a Get-a-map service; providing a free mapping service of up to 10 maps at various scales subject to accepting their terms and conditions which include displaying a copyright acknowledgement. I personally find these too small to be of much use.
Better sources of free maps are 
or 
. Click on the map and zoom in to 1:50000 scale and then save the image to your hard-drive. A nifty alternative is to use aerial photos from MultiMap-Photos The example here is Helvellyn with 1:50k map overlay!
Otherwise, I’ve found the free trial version of 
Image Assembler very useful for stitching these maps or digital photos together.
Author: Phil Newby