In reply to aljones27:
It depends how you want to approach things. The Stuart Marshall book is aimed at getting the hills ticked in as few days as possible.
I personally haven't found the routes hard going- I did one the other day from Grasmere: Silver Howe, Blea Crag, Pavey Ark, Harrison Stickle, Loft Crag, Pike of Stickle, Thunacar Knott, High Raise, Sargeant Man, Tarn Crag and back to Grasmere: 5 hours 30 minutes.
So, if you want as quick a completion as possible and don't want to plan your routes, that book is very useful.
Having said all that, there's something special about an unhurried stroll around Wainwright's hills.