Try Max Hastings book Chastise, about the raid. Unlike Brickhill's book (of its time , very jingoistic ) it does not shrink from some uncomfortable and inconvenient aspects of the raid .
Brickhill's book was first published in 1951, at which point most - and probably all - of the official files about Operation Chastise would still have been closed, so most of his material would have come from oral testimony, flight logs etc. He would probably also have had to submit the manuscript to the MoD in case he'd inadvertently revealed something which was subject to the Official Secrets Act. And like much of what was published in that era, Brickhill's book is written in what I what I would categorise as 'Commando War Library style'. Hastings is of course a much more 'serious' writer, but also had access to much material which Brickhill couldn't use.
Less sensitive World War II official files began being opened to researchers in the late 1950s, but as the more secret ones were subject to the 'thirty year rule' it wasn't until the mid-1970s that the more 'interesting' stuff, which was all batched as 1945, started to appear. Prior to the release of the official files on the Upkeep and Highball bouncing bombs in 1975 they were generally depicted as spherical, although they were of course cylindrical. Even so, some files were given longer dates - forty, fifty, seventy-five or even a hundred years.
When my late father decided to mount a window display about the 35th anniversary of the Battle of Britain in Southampton Weather Centre in the summer of 1975 he had to get written permission from the MoD to display copies of the original weather forecasts from nearby RAF stations because they were still official secrets.* During the war, public weather forecasts - on radio or in print - had ceased and exceptional weather events could only be reported in the press two weeks afterwards.
* Weather records for the city itself were destroyed when the Ordnance Survey building, which housed the then Southampton Met Office, was bombed during the Southampton Blitz in November/December 1940.