Luftwaffe Victorious by Mike Spick

I just got a Mylar wrapped (yay!) copy of this book by respected aviation historian Mike Spick. I was just wondering if there was anything too implausible in the book, or if it was all A or B grade alternate history.
 
It finally arrived yesterday. After reading it, I would have to say that this is probably the best Greenhill Alternate History. There was one minor thing I noticed though. Spick has the Germans launch an air raid on Scapa Flow on November 6 1940. One of the ships damaged is the HMS Hermes, which could not have been there, as it was historically in South Africa for repairs. Does anyone have a possible explanation for this?
 
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