Naval and Military Press have this two-volume history of the 1st Battalion, Bedfordshire Regiment up for sale at £12.99, discounted from £40.00. With postage, it will cost you £16.84 in total (I know that for a fact because I've just this minute ordered my own copies).
Steve Fuller is something of an expert on the Beds Regt and so this book should do the battalion justice. I have a 1914 Star trio and LSGC to one of the Beds regulars and so this book will be useful now, and in the future. I would imagine these volumes will be hard to come by before very long so grab yourself the set whilst you still can.