Hipper: Totally appreciate your post but,
Did the Enigma decodes have an input in the Battle of Britain?
Hinsley et al in 'British Intelligence in the Second World War' suggests that although British intelligence (all of it) was improving this was not a major factor in the Battle of Britain. It seems up to then mostly strategic intelligence was being derived. Hinsley credits 'the tenacity of British resistance' to the GAF's failure.
Just had a look at the river dealers, he wrote the book in 1979, and it was part of a 5 volume set, and whilst he may have had access to the files, some as well well know may have been 'weeded' or not declassified. therefore his history maybe incomplete. When you consider so much was lost in 1945 when Bletchley Park was disbanded.
The RAF may not have declassified many of its own records, we just do not know. We do know that R V Jones had a degree of access to Enigma product and intelligence, also PoW interrogation via Squadron Leader Felkin, in particular looking for Knickebein.