Memory Map works much better and differently on a PC it also gives you many more options and whilst OS 1:25000 are fantastic for walking the 1:50000 are better for Cycling.I'd rather plan on a tablet than a PC. Tablets are more nifty and comfy for me. I tried to get the iPhone app to record/log my trip yesterday but when I'd finished, the stats were clearly wrong...probably because I did some app switching after starting it. That may have interrupted it. I'm starting to realise that what I want is a list of hyper local off-road routes and they barely exist at all. So I may as well just invent my own using the OS 1:25000 maps. Would be nice to record some and share them though.
As an option are you aware if you buy an OS map for £8.00 you get a digital copy of the map you can download to your phone and tablet.