not sure if this has been mentioned here already but if not you can download a google earth file on http://www.brock-family.org/gavin/google-earth/osmaps.html that gives you an OS 1:50k overlay of the UK. There's also more detailed info included than on the OS if you zoom in and refresh (right click on the overlay folder in 'my places' and hit refresh) - some farm names etc. Had a good few hours routeplanning and spying out places to visit this morning!