In reply to joshedwr:
I bet the problem is there are so few peaks in the Peak! There is quite a lot of land over 400 mtrs, Burbage Bridge is 402 by the looks of the map for instance but where is the summit of that moorland?
I was walking with my family, well not the teenagers because they are teenagers, in upper Dovedale and there is lots of stuff down there above 400 mtrs, Chrome Hill is and that is a peak, but as the head of valley rises towards axe edge loads of it is higher than 400. The main road is at 500 mtrs at its highest I think!