A good map covering the Dark Peak area (ie northern area) of the Peak District National Park. This is the bit with all the gritstone edges in it.
Scale: 1:40,000 with a detailed 1:20,000 enlargement of the Kinder Plateau.
Plus lots of other useful information.
Printed on waterproof plastic which is extremely durable and light (less than half the weight of a laminated map - 100g) and are produced in conjunction with Harvey Maps.