Bill Birkett set out to catalogue every distinct Lakeland top of at least 1,000 feet (305 m) lying within the National Park boundary — 541 fells in all, the most exhaustive of the popular Lakeland lists. Where Wainwright was selective, Birkett is comprehensive: his round takes in every named knott, crag and subsidiary summit the bigger lists pass by, from the great peaks down to obscure tops few walkers ever name. First published by Collins Willow in 1994 as Complete Lakeland Fells, the book sets out over 120 classic walks linking the tops, and the full round — now affectionately called “doing the Birketts” — has become the natural, and far longer, next step for walkers who have completed the 214.