Mike, I agree that the RAF Museum, would serve as an excellent long-term repository for your Dad’s logbooks. If he served in Bomber Command, I would also suggest that, prior to sending them to Hendon, you consider contacting the International Bomber Command Centre in Lincoln. The University of Lincoln manages the IBCC’s digital archive and a team (including Grob Jr)digitises any BC records, logbooks, letters, photos etc with the aim of allowing public access to an extensive online archive. However, Use of the material is closely controlled with owners retaining copyright. The IBCC tends not to hold onto these important relics and would normally return them to the owners, so you could take that route as well as presenting the originals to the RAF Museum.