[Caz]

Haven't read anything from the Mirror. Wouldn't waste money on it. Certainly wouldn't even consider buying the book.
Have no particular interest in the Royal family as such.
As Janet says though, if he thought there was something to tell, why not give the proceeds to charity?
Mind you, it's not as if he's telling anything new anyway, really is it.  
Personally I think the guy is obsessed. Someone referred to him as "A born again Diana addict". Judging from what we saw of his home, that seems a pretty fair observation.

On the other hand, if this is the only thing that keeps the controversial subject of her death in the public domain, maybe it is serving some purpose.
Six years on and still no inquest. Wonder what the history books will be saying in 100 years time.