Still not sure whether the issue is
a)Simply that the authors are paraphrasing the letters - ie its not about
what the letters contain, but simply because the copyright on the material belongs to the Estate, & that they object on principle to its being used.
Or
b) Whether its because the letters contain
information the Estate do not want to be published - but I suspect that if the content of the letters was along the lines of 'Dear Hilary, went into Birmingham today & had tea. It rained for a bit, but then the sun came out & made the whole place seem rather Elvish. Yours Ronald' then no-one at the Estate would be bothered if it was published.
However, I accept that we'll never be told one way or the other, so further speculation seems pointless.
Narfforc, via Facebook, made me aware of this novel 'Looking for the King: An Inklings Novel '[Hardcover]
http://www.amazon.com/gp/reader/1586...pt#reader-link In it, Tolkien, Lewis & the other Inklings appear as supporting characters, & we've seen other novels where the same thing happens (ie 'Here, There Be Dragons (Chronicles of the Imaginarium Geographica'
http://www.amazon.com/There-Dragons-...9942839&sr=1-1 ). I begin to feel that Tolkien is moving towards being a 'fictional' character himself, the dreamy, slightly bumbling old professor with his pipe. We may never get to know the real man.