In addition to the book RAF Bomber Command Losses by W Chorley, for those who may be researching losses in other commands, there are 2 books: RAF Fighter Comand Losses by N Franks and RAF Coastal Command Losses by R McNeil. You should be able to borrow copies through major libraries and I believe that they are available to buy at
www.ianallanpublishing.com. All the books are invaluable as they list losses and circumstances.