I'm auctioning some OS Pathfinder maps on ebay covering parts of Devon and Cornwall that might be interesting to you for walking, Rights of Way, looking at old railways and if you are interested simply in maps! They are revised up to the late eighties in most cases but I think are still relevant.
The first one is item 2494439355, my user id on ebay is pdsteveo.
Please forgive this intrusion if the maps are of no interest to you.