Printing - Map Type to Print
The map that you view on the screen does not need to be the same as the map type that you wish to print. For a long route, which will get printed on multiple pages, it may well be much easier to work on say the OS Road Map, whilst you are in fact going to printing say OS 1:25,000 HD maps.
The below screenshot shows OS Road Map on the screen, but the Print Box is set to print OS 1:25,000 HD mapping for the route, with a 10% overlap between pages.