A hill is classified as a Birkett if it is one of the 541 Lake District fells described in Bill Birkett's book Complete Lakeland Fells. This book, first published in 1994, described 129 walks taking in every hill over 1000 feet and is now out of print although you can find copies second hand.
In 1997 he condensed and distilled the essential information from the original book into a handier format and The Lakeland Fells Almanac was the result. It's small, easy to use and carry in a pocket or rucksack.
Click on any Birkett on the map below to find out more about it: