When you say developing, what do you actually mean? I visited Carrock on Saturday, and was confronted by a National Parks warden looking to see my permit, until explaining we were there purely for photography and exploration purposes and nothing to do with the minerals of the site!
A license to mine or procure Wolframite could be very costly if this is what your intending doing, but I am led to believe that all areas where Wolframite is found are covered by SSSI regulations and are protected!