Mountains measured: Surveyors reclassify UK hills
6 May 2013 Last updated at 09:19 BST
A group of amateur surveyors has been climbing and re-measuring some of Britain's highest peaks, to see if they are high enough to be called mountains.
Already two mountains have been reclassified while the north Wales mountain, Tal y Fan in Snowdonia, is the latest to be measured to see if it should be downgraded to a hill.
Graham Satchell reports.