These maps are no longer available from Ordnance Survey. You'll need to get individual versions for the National Three Peaks Challenge - the OS Explorer 392 for Ben Nevis, the OS Explorer OL6 for Scafell Pike, and the OS Explorer OL17 for Snowdon.
Ordnance Survey's Three Peaks Challenge map pack, including detailed OS Explorer level maps of each mountain.
Available with Ben Nevis, Scafell Pike and Snowdon cover images, each version includes OS maps of all three mountains and a basic road map.
Great value compared to buying all three maps separately, and very convenient having such compact versions of each route. Save weight and time keeping this single set of maps with you throughout the challenge.
A 'Three Peaks Challenge Essential' buy!