Personally i use MemoryMap...
http://shop.memory-map.co.uk/acatalog/maps-digital-map-shop.htmlthat way i can print off the area i need and laminate it
instant light waterproof map you can also print at
1:25,000 scale so you can see detail better, especially if your eysights getting worse!
still at 1:50,000 though if you know what i mean? you can then tick of features as you go, so you know where you are without ruining a paper map
I also like Harvey maps, although more expensive i find them easy to read and i like the 1:40,000 scale