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Right. So, I've got the book in front of me.
Now, you're going to tell me where it discusses policy around the Mossie, and where it explains how "Harris wouldn't have it." Because I can find no such reference.
There are no judgements in the book, just facts. There are no pages treating what people DID NOT DO...but there are a lot about what people actually did.
There are quite some passages pointing about Harris' insistance in attacking with massive bomber raids on german cities, not on the mossie. The book won't say "Harris didn't want the mossie", but it clearly points out that Harris wanted the largest formation of the largest bombers Britain could give to conduct his bombings. The Mossie was seen as a pathfinder, as a good plane for small raids, even while it had the potential to be quite more than that.
As such Harris never gave a thought about increasing its production at the cost of the bombers. Neither he would've had it witha sustitution of the Lancaster by the Mossie. Yes, the book doesn't say "Harris said no to substituting lancasters by mosquitoes" But it's implicit for anyone reading the narration that what Harris wanted wasnt at all a fleet of mosquitoes and that had a proposal been raised for that purpose, he would've turned it down.
About the parts of the message you asked reference for, about Harris' fixation about area bombing, saturation attacks, and his almost resignation when Bomber Command was forced to cooperate in Overlord preparatives (which involved quite a deal of precision bombigns), the book tells the whole story.
You asked me for a reference, I gave you that book. Read the whole strategic campaign parts (the book chapters are ordered by time, so you might have to jump between chapters to keep the whole bomber command history as is told by it). If when you're done reading it you don't share my impressions then we're reading different books.
Bit pressed of time right now to comment more, but will do later when back at home. I'ts been a while since I last read the book and would need to have it near to quote passages, pages ,etc.
BTW I also encourage some ppl here to read R.V. Jones' "most secret war". Gives quite a picture of what the british could hit and could not by night, and with how much precision.