"...the doco proves..." How old is it?
The whole issue was caused by faulty intel on the RN's part. Read a recently published(like 2014ish) book about Brit W.W. I spooks (I forget the title. I'll have to look.) that said the RN knew where the Imperial Fleet was and what it was doing but didn't tell Beatty or Jellicoe in order to keep Room 40 secrets secret. Along the lines of not talking about Ultra.