Just got an email. Seems pretty good value for access to all OS Explorer and Landranger maps electronically and print it yourself and includes route planning etc too.
https://www.ordnancesurvey.co.uk/shop/os-maps-subscription-12-months-recurring.html
Over the last few months, we’ve been working on a new version of our online route planning tool, OS getamap. As a newsletter subscriber, we wanted you to be the first to know that the new version, OS Maps, is now ready to use and has some great features to help you plan for a memorable Bank Holiday weekend!
You can use OS Maps on your smartphone, tablet and desktop PC, and it gives you online access to every Explorer and Landranger map so you can plan walking, running and cycling routes and print maps on both A3 and A4.
As your complete tool for outdoor adventure, you could use OS Maps to plan a long weekend exploring a National Park with a map print and the route on your GPS device, or you could use the database of 40,000 places to visit to make the most of a trip to a historic town or picturesque village! You can also try over 500,000 existing routes and adjust your preferences to find out how long each route will take you to walk, run or ride.