When printing maps it's possible to change the style of the background Ordnance Survey mapping from the default coloured maps into a black and white lined style. This is of particular benefit when printing the maps out. It saves ink and can make clearer-looking maps.
Please bear in mind that this currently only works when printing maps at a large-scale, e.g. zoomed in below 1:2,000 scale.
It's very simple to switch the style of the background mapping: